Daikin R71FUV1 Service Manual
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Daikin R71FUV1 Service Manual

Skyair series service diagnosis
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Table Of Contents
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Table of Contents

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Si20 - 701_B
Pocket
Manual
Service Diagnosis

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Table of Contents
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Summary of Contents for Daikin R71FUV1

  • Page 1 Si20 - 701_B Pocket Manual Service Diagnosis...

  • Page 2: Table Of Contents

    SkyAir Series Si20-701_B 1. List of Applicable Models ........1 2. Symptom-based Troubleshooting ....29 2.1 Overview ............29 2.2 Equipment does not Operate ......31 2.3 Indoor Unit Fan Operates, but Compressor does not Operate ....33 2.4 Cooling / Heating Operation Starts but Stops Immediately ............36 2.5 After Unit Shuts Down, It cannot be Restarted for a While ............38...
  • Page 3 Si20-701_B SkyAir Series 3.14AJ Capacity Setting Abnormality ...... 108 3.15C1 Transmission Error (between Indoor Unit PCB and Fan PCB) ..115 3.16C1 Transmission Error (between Indoor Unit PCB and Adaptor PCB) ........118 3.17C4, C5, C9 Thermistor Abnormality ....121 3.18C6 Defective Combination (between Indoor Unit PCB and Fan PCB) ..
  • Page 4 SkyAir Series Si20-701_B 3.44H7 Outdoor Unit Fan Motor Signal Abnormality ............235 3.45H9, J3, J5, J6, J7, J8 Thermistor System Abnormality ............237 3.46H9 Outdoor Air Thermistor System Abnormality ............239 3.47J1 Pressure Sensor Abnormality .....241 3.48J2 Current Sensor System Abnormality ...243 3.49J3 Discharge Pipe Thermistor System Abnormality ............245 3.50J5 Suction Pipe Thermistor Abnormality ..248 3.51J6 Heat Exchanger Thermistor System...
  • Page 5 Si20-701_B SkyAir Series 3.73LC Transmission Error (between Control PCB and Inverter PCB) ..323 3.74P1 Inverter Over-Ripple Protection ....326 3.75P1 Open Phase or Power Supply Voltage Imbalance ............329 3.76P4 Radiation Fin Thermistor Abnormality ..331 3.77P4 Radiation Fin Thermistor or Related Abnormality ............
  • Page 6 SkyAir Series Si20-701_B 3.99UA Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller ..........427 3.100UA Field Setting Switch Abnormality ....430 3.101UA Field Setting Switch and Transmission Line Abnormality ..........433 3.102UC Centralized Address Setting Error .....437 3.103UC Address Duplication of Centralized Controller ............438 3.104UE Transmission Error between Centralized Controller and Indoor Unit ........439...
  • Page 7 Si20-701_B SkyAir Series...

  • Page 8: List Of Applicable Models

    List of Applicable Models Si20-701_B 1. List of Applicable Models R-FU Series Series Outdoor Units Indoor Units R71FUV1 FA71FVEK R100FUV1 FA100FVEK R71FUV1 FH71BVE R100FUV1 FH100BVE R-FUV1 R71FUV1 FHC71KVE R100FUV1 FHC100KVE R71FUV1 FV71LVE R100FUV1 FV100LVE R71FUY1 FA71FVEK R100FUY1 FA100FVEK R71FUY1 FH71BVE...
  • Page 9 Si20-701_B List of Applicable Models R-GA Series Series Outdoor Units Indoor Units R50GAV1A FH50BVE R-GAV R60GAV1A FH60BVE R-G Series Series Outdoor Units Indoor Units R35GV1 FH35BVE R50GV1 FH50BVE R60GV1 FH60BVE R35GV1 FHB35FV1 R50GV1 FHB45FV1 R60GV1 FHB60FV1 R-GV1 R35GV1 FHC35KVE R50GV1 FHC50KVE R60GV1 FHC60KVE...
  • Page 10 List of Applicable Models Si20-701_B R-KU Series Series Outdoor Units Indoor Units R71KUV1 FAY71FAVE R100KUV1 FAY100FAVE R71KUV1 FHK71FV1 R71KUV1 FHY71BVE R100KUV1 FHY100BVE R71KUV1 FHYB71FV1 R-KUV1 R100KUV1 FHYB100FV1 R71KUV1 FHYC71KVE R100KUV1 FHYC100KVE R71KUV1 FUY71FJV1 R100KUV1 FUY100FJV1 R71KUV1 FVY71LVE R100KUV1 FVY100LVE R71KUY1 FAY71FAVE R100KUY1 FAY100FAVE...
  • Page 11 Si20-701_B List of Applicable Models Series Outdoor Units Indoor Units R71KUVAL FAY71FAVE R100KUVAL FAY100FAVE R71KUVAL FHY71BVE R100KUVAL FHY100BVE R-KUVAL R71KUVAL FHYC71KVE R100KUVAL FHYC100KVE R71KUVAL FVY71LVE R100KUVAL FVY100LVE R125KUTAL FHY125BVE R125KUTAL FHYC125KVE R-KUTAL R140KUTAL FHYC140KVE R125KUTAL FVY125LVE R-KUTALK R140KUTALK FHYC140KVE R-KUYALK R140KUYALK FHYC140KVE R125KUYAL...
  • Page 12 List of Applicable Models Si20-701_B Series Outdoor Units Indoor Units R71LUV1 FHY35BVE × 2 R100LUV1 FHY50BVE × 2 R-LUV1 (Twin) R71LUV1 FHYC35KVE × 2 R100LUV1 FHYC50KVE × 2 R71LUY1 FAY71FAVE R100LUY1 FAY100FAVE R71LUY1 FAY71LVE R71LUY1 FDYM03FAV1 R100LUY1 FDYM04FAV1 R125LUY1 FDYM05FAV1 R140LUY1 FDYM06FAV1 R71LUY1...
  • Page 13 Si20-701_B List of Applicable Models Series Outdoor Units Indoor Units R140LUY1 FHY50BVE × 3 R-LUY1 (Triple) R140LUY1 FHYC50KVE × 3 R-LUY2S R42LUY2S FHC21KV2S × 2 (Twin) R71LUVAL FAY71FAVE R100LUVAL FAY100FAVE R71LUVAL FAY71LVE R71LUVAL FDYM03FAVAL R100LUVAL FDYM04FAVAL R-LUVAL R100LUVAL FHY100BVE R71LUVAL FHYC71KVE R100LUVAL FHYC100KVE...
  • Page 14 List of Applicable Models Si20-701_B R-NU Series Series Outdoor Units Indoor Units R18NUV1(4)(5) FDBG18NUV1(4)(5) R21NUV1(4)(5) FDBG21NUV1(4)(5) R26NUV1(4)(5) FDBG26NUV1(4)(5) R26NUV1(4)(5) FDMG26NUV1(4)(5) R30NUV1 FDMG30NUV1 R36NUV1(5) FDMG36NUV1(5) R21NUV1(4)(5) FH21NUV1(4)(5) R-NUV1 R26NUV1(4)(5) FH26NUV1(4)(5) R30NUV1 FH30NUV1 R36NUV1(5) FH36NUV1(5) R18NUV1(4)(5) FHC18NUV1(4)(5) R21NUV1(4)(5) FHC21NUV1(4)(5) R26NUV1(4)(5) FHC26NUV1(4)(5) R30NUV1 FHC30NUV1 R36NUV1(5) FHC36NUV1(5)
  • Page 15 Si20-701_B List of Applicable Models Series Outdoor Units Indoor Units R13NUV2S FDBT13NUV2S R13NUV2S FDBT13PUV2S R18NUV2S FDBT18NUV2S R18NUV2S FDBT18PUV2S R24NUV2S FDBT24NUV2S R24NUV2S FDBT24PUV2S R30NUV2S FDBT30NUV2S R30NUV2S FDBT33NUV2S R36NUV2S FDBT36NUV2S R30NUV2S FDMG30NUV2S R-NUV2S R36NUV2S FDMG36NUV2S R13NUV2S1 FH13NUV2S R18NUV2S1 FH18NUV2S R24NUV2S FH24NUV2S R30NUV2S FH30NUV2S R36NUV2S FH36NUV2S...
  • Page 16 List of Applicable Models Si20-701_B Series Outdoor Units Indoor Units R30NUY2S FDBT30NUV2S R30NUY2S FDBT33NUV2S R36NUY2S FDBT36NUV2S R42NUY2S FDBT42NUV2S R48NUY2S FDBT48NUV2S R48NUY2S FDBT48PUV2S R30NUY2S FDMG30NUV2S R36NUY2S FDMG36NUV2S R42NUY2S FDMG42NUV2S R48NUY2S FDMG48NUV2S R51NUY2S FDMG51NUV2S R56NUY2S FDMG56NUV2S R-NUY2S R48NUY2S FDMG48NVV2S R51NUY2S FDMG51NVV2S R56NUY2S FDMG56NVV2S R48NUY2S FDMG48PUV2S...
  • Page 17 Si20-701_B List of Applicable Models R-PU Series Series Outdoor Units Indoor Units R30PUV2S FDBT30PUV2S R33PUV2S FDBT33PUV2S R36PUV2S FDBT36PUV2S R30PUV2S FDMG30PUV2S R36PUV2S FDMG36PUV2S R-PUV2S R30PUV2S FDMG30NVV2S R36PUV2S FDMG36NVV2S R30PUV2S FH30PUV2S R36PUV2S FH36PUV2S R30PUV2S FHC30PUV2S R36PUV2S FHC36PUV2S R30PUY2S FH30PUV2S R36PUY2S FH36PUV2S R42PUY2S FH42PUV2S R30PUY2S FHC30PUV2S...
  • Page 18 List of Applicable Models Si20-701_B RR-M Series Series Outdoor Units Indoor Units RR71MV1 FAQ71BVV1B RR71MV1 FBQ71DV1 RR-MV1 RR71MV1 FCQ71KVEA RR71MV1 FHQ71BVV1B RR71MY1 FAQ71BVV1B RR100MY1 FAQ100BVV1B RR71MY1 FBQ71DV1 RR100MY1 FBQ100DV1 RR125MY1 FBQ125DV1 RR140MY1 FBQ140DV1 RR-MY1 RR71MY1 FCQ71KVEA RR100MY1 FCQ100KVEA RR125MY1 FCQ125KVEA RR140MY1 FCQ140KVEA RR71MY1...
  • Page 19 Si20-701_B List of Applicable Models RY-FV Series Series Outdoor Units Indoor Units RY35FV1A FHY35BVE RY35FV1A FHYB35FV1 RY-FV1A RY35FV1A FHYC35KVE RY35FV1A FHYK35FJV1 RY-G Series Series Outdoor Units Indoor Units RY50GVAL FHY50BVE RY60GVAL FHY60BVE RY-GVAL RY50GVAL FHYC50KVE RY60GVAL FHYC60KVE RY50GV1A FHYB45FV1 RY60GV1A FHYB60FV1 RY50GV1A FHYC50KVE...
  • Page 20 List of Applicable Models Si20-701_B RY-KU Series Series Outdoor Units Indoor Units RY71KUV1 FAY71FAVE RY100KUV1 FAY100FAVE RY71KUV1 FHY71BVE RY100KUV1 FHY100BVE RY71KUV1 FHYB71FV1 RY100KUV1 FHYB100FV1 RY71KUV1 FHYC71KVE RY-KUV1 RY100KUV1 FHYC100KVE RY71KUV1 FHYK71FJV1 RY71KUY1 FHYK71FJV1 RY71KUV1 FUY71FJV1 RY100KUV1 FUY100FJV1 RY71KUV1 FVY71LVE RY100KUV1 FVY100LVE RY71KUY1 FAY71FAVE...
  • Page 21 Si20-701_B List of Applicable Models RY-LU Series Series Outdoor Units Indoor Units RY71LUV1 FAY71FAVE RY100LUV1 FAY100FAVE RY71LUV1 FAY71LVE RY71LUV1 FDYB71KAVE RY71LUV1 FDYM03FAV1 RY100LUV1 FDYM04FAV1 RY71LUV1 FHY71BVE RY100LUV1 FHY100BVE RY-LUV1 RY71LUV1 FHYB71FV1 RY100LUV1 FHYB100FV1 RY71LUV1 FHYC71KVE RY100LUV1 FHYC100KVE RY71LUV1 FHYK71FJV1 RY71LUV1 FUY71FJV1 RY100LUV1 FUY100FJV1...
  • Page 22 List of Applicable Models Si20-701_B Series Outdoor Units Indoor Units RY71LUY1 FAY71FAVE RY100LUY1 FAY100FAVE RY71LUY1 FAY71LVE RY140LUY1 FDY06KAY1 RY71LUY1 FDY71KFV1 RY100LUY1 FDY100KFV1 RY125LUY1 FDY125KFV1 RY160LUY1 FDY160KFV1 RY71LUY1 FDYB71KAVE RY71LUY1 FDYM03FAV1 RY100LUY1 FDYM04FAV1 RY125LUY1 FDYM05FAV1 RY140LUY1 FDYM06FAV1 RY71LUY1 FHY71BVE RY100LUY1 FHY100BVE RY-LUY1 RY125LUY1 FHY125BVE...
  • Page 23 Si20-701_B List of Applicable Models Series Outdoor Units Indoor Units RY71LUY1 FHY35BVE × 2 RY100LUY1 FHY50BVE × 2 RY125LUY1 FHY60BVE × 2 RY140LUY1 FHY71BVE × 2 RY-LUY1 RY71LUY1 FHYC35KVE × 2 RY100LUY1 FHYC50KVE × 2 RY125LUY1 FHYC60KVE × 2 RY140LUY1 FHYC71KVE ×...
  • Page 24 List of Applicable Models Si20-701_B RZQ-B Series Series Outdoor Units Indoor Units RZQ-B7V3B RZQS100B7V3B FCQ35C7VEB × 3 RZQ100B8W1B FAQ100BUV1B RZQ100B8W1B FBQ100B7V3B RZQ125B8W1B FBQ125B7V3B RZQ100B8W1B FCQ100C7VEB RZQ125B8W1B FCQ125C7VEB RZQ100B8W1B FCQH100C7VEB RZQ-B8W1B RZQ125B8W1B FCQH125C7VEB RZQ140B8W1B FCQH140C7VEB RZQ125B8W1B FDQ125B7V3B RZQ100B8W1B FHQ100BUV1B RZQ125B8W1B FHQ125BUV1B RZQ100B8W1B FUQ100BUV1B RZQ125B8W1B...
  • Page 25 Si20-701_B List of Applicable Models Series Outdoor Units Indoor Units RZQ100B8W1B FBQ35B7V1 × 3 RZQ125B8W1B FBQ50B7V1 × 3 RZQ140B8W1B FBQ50B7V1 × 3 RZQ100B8W1B FCQ35C7VEB × 3 RZQ125B8W1B FCQ50C7VEB × 3 RZQ140B8W1B FCQ50C7VEB × 3 RZQ-B8W1B (Triple) RZQ100B8W1B FFQ35BV1B × 3 RZQ125B8W1B FFQ50BV1B ×...
  • Page 26 List of Applicable Models Si20-701_B RZQ-C Series Series Outdoor Units Indoor Units RZQ71C7V1B FAQ71BUV1B RZQ100C7V1B FAQ100BUV1B RZQ71C7V1B FBQ71B7V3B RZQ100C7V1B FBQ100B7V3B RZQ125C7V1B FBQ125B7V3B RZQ100C7V1B FCQ100C7VEB RZQ125C7V1B FCQ125C7VEB RZQ140C7V1B FCQ140C7VEB RZQ71C7V1B FCQ71C7V3B RZQ100C7V1B FCQ100C7V3B RZQ125C7V1B FCQ125C7V3B RZQ140C7V1B FCQ140C7V3B RZQ100C7V1B FCQH100C7VEB RZQ-C7V1B RZQ125C7V1B FCQH125C7VEB RZQ140C7V1B FCQH140C7VEB...
  • Page 27 Si20-701_B List of Applicable Models Series Outdoor Units Indoor Units RZQ140C7V1B FAQ71BUV1B × 2 RZQ71C7V1B FBQ35B7V1 × 2 RZQ100C7V1B FBQ50B7V1 × 2 RZQ125C7V1B FBQ60B7V1 × 2 RZQ140C7V1B FBQ71B7V3B × 2 RZQ100C7V1B FCQ50C7VEB × 2 RZQ125C7V1B FCQ60C7VEB × 2 RZQ140C7V1B FCQ71C7VEB × 2 RZQ71C7V1B FCQ35C7V3B ×...
  • Page 28 List of Applicable Models Si20-701_B Series Outdoor Units Indoor Units RZQ125C7V1B FBQ35B7V1 × 4 RZQ140C7V1B FBQ35B7V1 × 4 RZQ125C7V1B FCQ35C7VEB × 4 RZQ140C7V1B FCQ35C7VEB × 4 RZQ125C7V1B FCQ35C7V3B × 4 RZQ-C7V1B (Double-twin) RZQ140C7V1B FCQ35C7V3B × 4 RZQ125C7V1B FFQ35BV1B × 4 RZQ140C7V1B FFQ35BV1B ×...
  • Page 29 Si20-701_B List of Applicable Models Series Outdoor Units Indoor Units RZQ200C7Y1B FBQ50B7V1 × 4 RZQ250C7Y1B FBQ60B7V1 × 4 RZQ200C7Y1B FCQ50C7VEB × 4 RZQ250C7Y1B FCQ60C7VEB × 4 RZQ-C7Y1B (Double-twin) RZQ200C7Y1B FFQ50BV1B × 4 RZQ250C7Y1B FFQ60BV1B × 4 RZQ200C7Y1B FHQ50BUV1B × 4 RZQ250C7Y1B FHQ60BUV1B ×...
  • Page 30 List of Applicable Models Si20-701_B RZQ-H Series Series Outdoor Units Indoor Units RZQ100HY4A FBQ100DV1 RZQ125HY4A FBQ125DV1 RZQ160HY4A FBQ140DV1 RZQ-HY RZQ100HY4A FCQ100KVEA RZQ125HY4A FCQ125KVEA RZQ100HY4A FHQ100BVV1B RZQ125HY4A FHQ125BVV1B RZQ-K Series Series Outdoor Units Indoor Units RZQ71KAVLT FBQ71DVET RZQ100KAVLT FBQ100DVET RZQ125KATLT FBQ125DVET RZQ140KATLT FBQ140DVET RZQ-KA...
  • Page 31 Si20-701_B List of Applicable Models RZQS-B Series Series Outdoor Units Indoor Units RZQS71B7V3B FAQ71BUV1B RZQS100B7V3B FAQ100BUV1B RZQS71B7V3B FBQ71B7V3B RZQS100B7V3B FBQ100B7V3B RZQS71B7V3B FCQ71C7VEB RZQS100B7V3B FCQ100C7VEB RZQS-B7V3B RZQS71B7V3B FCQH71C7VEB RZQS100B7V3B FCQH100C7VEB RZQS71B7V3B FHQ71BUV1B RZQS100B7V3B FHQ100BUV1B RZQS71B7V3B FUQ71BUV1B RZQS100B7V3B FUQ100BUV1B RZQS71B7V3B FBQ35B7V1 × 2 RZQS100B7V3B FBQ50B7V1 ×...
  • Page 32 List of Applicable Models Si20-701_B RZQS-C Series Series Outdoor Units Indoor Units RZQS125C7V1B FBQ125B7V3B RZQS125C7V1B FCQ125C7VEB RZQS140C7V1B FCQ140C7VEB RZQS125C7V1B FCQH125C7VEB RZQS-C7V1B RZQS140C7V1B FCQH140C7VEB RZQS125C7V1B FDQ125B7V3B RZQS125C7V1B FHQ125BUV1B RZQS125C7V1B FUQ125BUV1B RZQS140C7V1B FAQ71BUV1B × 2 RZQS125C7V1B FBQ60B7V1 × 2 RZQS140C7V1B FBQ71B7V3B × 2 RZQS125C7V1B FCQ60C7VEB ×...
  • Page 33 Si20-701_B List of Applicable Models RZR-HU Series Series Outdoor Units Indoor Units RZR100HUY1 FBQ100DV1 RZR125HUY1 FBQ125DV1 RZR140HUY1 FBQ140DV1 RZR100HUY1 FCQ100KVEA RZR125HUY1 FCQ125KVEA RZR-HUY1 RZR140HUY1 FCQ140KVEA RZR100HUY1 FHQ100BV1B RZR125HUY1 FHQ125BV1B RZR100HUY1 FHQ100BVV1B RZR125HUY1 FHQ125BVV1B RZR30HUY2S FBQ30DV2S RZR36HUY2S FBQ36DV2S RZR42HUY2S FBQ42DV2S RZR48HUY2S FBQ48DV2S RZR-HUY2S RZR30HUY2S...
  • Page 34 List of Applicable Models Si20-701_B Series Outdoor Units Indoor Units RZR30KUV2S FBQ30DV2S RZR36KUV2S FBQ36DV2S RZR42KUV2S FBQ42DV2S RZR48KUV2S FBQ48DV2S RZR-KUV2S RZR30KUV2S FCQ30KV2S RZR36KUV2S FCQ36KV2S RZR42KUV2S FCQ42KV2S RZR48KUV2S FCQ48KV2S RZY-L Series Series Outdoor Units Indoor Units RZY71LV1 FAY71FAVE RZY-LV1 RZY71LV1 FHYB71FV1 RZY71LV1 FHYC71KVE RZY71LVAL FAY71FAVE...
  • Page 35 Si20-701_B List of Applicable Models CMSQ Series Series Outdoor Units Indoor Units FMCQ50A7VEB FMCQ60A7VEB FMCQ71A7VEB FMCQ100A7VEB FMCQ125A7VEB FMDQ50A7V3B FMDQ60A7V3B CMSQ-A7W1B CMSQ200A7W1B FMDQ71A7V3B (Multi) CMSQ250A7W1B FMDQ100A7V3B FMDQ125A7V3B FMDQ50B7VEB FMDQ60B7VEB FMDQ71B7VEB FMDQ100B7VEB FMDQ125B7VEB...

  • Page 36: Overview

    Symptom-based Troubleshooting Si20-701_B 2. Symptom-based Troubleshooting 2.1 Overview Symptom Details of Measures Equipment does not operate. Refer to P.31 Indoor unit fan operates, but Refer to P.33 compressor does not operate. Cooling/heating operation starts Refer to P.36 but stops immediately. After unit shuts down, it cannot Refer to P.38 be restarted for a while.
  • Page 37 Si20-701_B Symptom-based Troubleshooting Symptom Details of Measures Indoor unit fan operates in “L” It is normal. tap for 1 minute in “program dry” The monitoring function forcibly mode even if compressor is not operates the fan for 1 minute. operating. It is normal.

  • Page 38: Equipment Does Not Operate

    Symptom-based Troubleshooting Si20-701_B 2.2 Equipment does not Operate Applicable Model All models of SkyAir series Supposed Causes Fuse blown or disorder of contact in operation circuit Defective operation switch or contact point Defective high pressure switch Defective magnetic switch for fan motor Activation or fault of overcurrent relay for fan motor Defective overcurrent relay for compressor Defective compressor protection thermostat...
  • Page 39 Si20-701_B Symptom-based Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the power switch Turn ON the OFF or fuse for power power switch or switch blown? replace the fuse.
  • Page 40 Symptom-based Troubleshooting Si20-701_B 2.3 Indoor Unit Fan Operates, but Compressor does not Operate Applicable Model All models of SkyAir series Supposed Causes Fuse blown or disorder of contact in operation circuit Defective thermistor Defective indoor/outdoor unit PCB Defective magnetic switch Defective power transistor Defective compressor...
  • Page 41 Si20-701_B Symptom-based Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. · Indoor unit fan runs at setting airflow rate. · (In cooling) When suction air temperature is higher than set temperature ·...
  • Page 42 Symptom-based Troubleshooting Si20-701_B...

  • Page 43: Cooling / Heating Operation Starts But Stops Immediately

    Si20-701_B Symptom-based Troubleshooting 2.4 Cooling / Heating Operation Starts but Stops Immediately Applicable Model All models of SkyAir series Supposed Causes Refrigerant overcharge Air mixed in refrigerant system Defective pressure switch Defective magnetic switch for outdoor unit fan motor Defective aux. relay for outdoor unit fan motor Soiled heat exchanger of outdoor unit There is an interfering item in airflow of outdoor unit Defective outdoor unit fan...
  • Page 44 Symptom-based Troubleshooting Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the wired type of remote controller wired or wireless? Is the Wireless operation lamp of Diagnose based remote controller on the error code blinking?

  • Page 45: After Unit Shuts Down, It Cannot Be Restarted For A While

    Si20-701_B Symptom-based Troubleshooting 2.5 After Unit Shuts Down, It cannot be Restarted for a While Applicable Model All models of SkyAir series Supposed Causes Overcurrent relay (for compressor) Overcurrent relay may act due to the following reasons • Lower voltage of power supply •...
  • Page 46 Symptom-based Troubleshooting Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Turn the operation switch ON and OFF, then wait at ON side. Does the unit start Normal. Unit is in operation after 3 3-min.
  • Page 47 Si20-701_B Symptom-based Troubleshooting there any temperature difference between Replace the inlet and outlet of electronic electronic expansion valve. expansion valve? there any temperature difference between Replace the four suction side and way valve. discharge side of four way valve? Check the Defective compressor compressor.

  • Page 48: Equipment Operates But Does Not Provide Cooling

    Symptom-based Troubleshooting Si20-701_B 2.6 Equipment Operates but does not Provide Cooling Applicable Model All models of SkyAir series Supposed Causes Wrong selection of model Refrigerant shortage Insufficient airflow in the indoor unit Increase of high pressure ∗ In addition, the following errors may be conceivable •...
  • Page 49 Si20-701_B Symptom-based Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Measure the temperature of suction air and discharge air. Temperature difference = Suction air temp. – Discharge air temp. Temperature difference for cooling should be between...
  • Page 50 Symptom-based Troubleshooting Si20-701_B Is the level of high pressure higher Check the each than normal level? item. • Refrigerant overcharge • Air mixed in refrigerant system • Soiled heat exchanger • Short circuit of discharge air • Disturbing item in airflow •...

  • Page 51: Equipment Operates But Does Not Provide Heating

    Si20-701_B Symptom-based Troubleshooting 2.7 Equipment Operates but does not Provide Heating Applicable Model All models of SkyAir series Supposed Causes Wrong selection of model Refrigerant shortage Insufficient airflow in the indoor unit Decrease of low pressure ∗ In addition, the following errors may be conceivable •...
  • Page 52 Symptom-based Troubleshooting Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the unit Wait for a while. in defrost mode? Normal Measure the temperature of suction air and discharge air.
  • Page 53 Si20-701_B Symptom-based Troubleshooting Is the level of low pressure lower Check the each than normal level? item. • Refrigerant overcharge • Soiled heat exchanger • Short circuit of discharge air • Disturbing item in airflow • Defective outdoor unit fan motor (Refer to troubleshooting “E7”.)

  • Page 54: Equipment Discharges White Mist

    Symptom-based Troubleshooting Si20-701_B 2.8 Equipment Discharges White Mist Applicable Model All models of SkyAir series Supposed Causes Humid installation site Installation site is dirty and with dense oil mists Soiled heat exchanger Clogged air filter Defective fan motor...
  • Page 55 Si20-701_B Symptom-based Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the room temperature higher than set value in cooling? Continue the unit operation. Normal Is white mist coming out from the unit? Remove the...

  • Page 56: Equipment Produces Loud Noise Or Vibration

    Symptom-based Troubleshooting Si20-701_B 2.9 Equipment Produces Loud Noise or Vibration Applicable Model All models of SkyAir series Supposed Causes Improper installation Contacts of fan, piping, casing, etc. Noise of refrigerant flow Operating noise of drain discharge equipment Noise of resin components contracting ∗...
  • Page 57 Si20-701_B Symptom-based Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Does [Installation work side] the noise generate with Correction of vibration of whole installation. ceilings and Reinforcement walls? for ceilings or walls...
  • Page 58 Symptom-based Troubleshooting Si20-701_B Continuous slight noise of Normal. "shoo..." during cooling The sound is or defrosting flushing noise of refrigerant inside air conditioning unit. Sound of "shoo..." generates just after operation start or Normal. stop, or defrosting The noise is a start or stop.

  • Page 59: Equipment Discharges Dust

    Si20-701_B Symptom-based Troubleshooting 2.10 Equipment Discharges Dust Applicable Model All models of SkyAir series Supposed Causes Carpet Animal hair Application (cloth shop,...) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
  • Page 60 Symptom-based Troubleshooting Si20-701_B 2.11 Remote Controller LCD Displays "88" Applicable Model All models of SkyAir series Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Trouble generates just after The unit is power supply checking to...

  • Page 61: Troubleshooting By Remote Controller

    Si20-701_B Troubleshooting by Remote Controller 3. Troubleshooting by Remote Controller 3.1 Procedure of Self-diagnosis by Remote Controller 3.1.1 Wired Remote Controller — BRC1C61/BRC1D61 If operation stops due to error, the remote controller’s operation LED blinks, and error code is displayed. (Even if stop operation is carried out, error contents are displayed when the inspection mode is entered.) The error code enables you to tell what kind of error caused...

  • Page 62: Wired Remote Controller

    Troubleshooting by Remote Controller Si20-701_B 3.1.2 Wired Remote Controller — BRC1E61 The following will be displayed on the screen when an error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Screen Operation lamp (1)Checking an error or warning...

  • Page 63: Wireless Remote Controller

    Si20-701_B Troubleshooting by Remote Controller (2)Taking corrective action · Press the Menu/Enter button to check the error code. · Take the corrective action specific to the model. Error code Applicable model names 3.1.3 Wireless Remote Controller If unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit blinks.
  • Page 64 Troubleshooting by Remote Controller Si20-701_B Press the INSPECTION/TEST button to select “inspection”. The equipment enters the inspection mode. The “Unit” indication is displayed and the Unit No. display shows blinking “0” indication. Set the Unit No. Press the UP or DOWN button and change the Unit No.
  • Page 65 Si20-701_B Troubleshooting by Remote Controller Normal status Enters inspection mode from normal status when the INSPECTION/TEST button is pressed. 1 Press INSPECTION/TEST button. If no button is pressed for 1 minute, equipment returns to normal status. When MODE selector button is pressed or no Press button is pressed...

  • Page 66: Error Codes And Description

    Troubleshooting by Remote Controller Si20-701_B 3.2 Error Codes and Description 3.2.1 Indoor Unit Model Name Error Contents of Error Code Indoor Unit PCB Abnormality Drain Water Level ∗1 System Abnormality Indoor Unit Fan Motor ∗1 Abnormality Swing Flap Motor Abnormality/Lock Drain System ∗1 Abnormality...
  • Page 67 Si20-701_B Troubleshooting by Remote Controller Model Name Error Contents of Error Code Error of External ∗3 Protection Device Indoor Unit PCB Abnormality Drain Water Level ∗2, 6 System Abnormality Indoor Unit Fan Motor ∗1 Abnormality Drain Water Level ∗3 ∗1 System Abnormality Indoor Unit Fan Motor Abnormality...
  • Page 68 Troubleshooting by Remote Controller Si20-701_B Model Name Error Contents of Error Code Capacity Setting ∗3, 4 ∗1 Abnormality Capacity Setting ∗3 ∗1 ∗2, 6 Abnormality Capacity Setting Abnormality Transmission Error (between Indoor Unit PCB and Fan PCB) Transmission Error (between Indoor Unit ∗5 PCB and Adaptor PCB)
  • Page 69 Si20-701_B Troubleshooting by Remote Controller 3.2.2 Outdoor Unit, System NON-Inverter Series Series Name Error Contents of Error Code Actuation of Safety Device Actuation of Safety Device Actuation of Safety Device Defective Outdoor Unit High Pressure System Abnormality High Pressure System Abnormality Low Pressure System Abnormality...
  • Page 70 Troubleshooting by Remote Controller Si20-701_B Series Name Error Contents of Error Code Defective Capacity Setting Refrigerant Shortage Reverse Phase Reverse Phase Transmission Error (Between Indoor Unit and Outdoor Unit) Transmission Error (Between Indoor Unit and Outdoor Unit) Transmission Error (Between Indoor Unit and Remote Controller) Transmission Error Between...
  • Page 71 Si20-701_B Troubleshooting by Remote Controller Inverter Series Model Name Error Contents of Error Code Activation of Outdoor Unit Protection Device Outdoor Unit PCB Abnormality Outdoor Unit PCB Abnormality Abnormally High Pressure Level (HPS) High Pressure Abnormality (Detected by the High Pressure Switch) Actuation of High Pressure Switch...
  • Page 72 Troubleshooting by Remote Controller Si20-701_B Model Name Error Contents of Error Code Electronic Expansion ∗6 Valve Abnormality Electronic Expansion Valve Coil Abnormality Electronic Expansion ∗1 ∗5 Valve Abnormality Electronic Expansion ∗2 ∗4 Valve Abnormality Discharge Pipe Temperature Abnormality Discharge Pipe Temperature Abnormality Discharge Pipe Temperature Control...
  • Page 73 Si20-701_B Troubleshooting by Remote Controller Model Name Error Contents of Error Code Discharge Pipe Thermistor System Abnormality Discharge Pipe Thermistor System Abnormality Thermistor System Abnormality Thermistor System Abnormality Heat Exchanger Thermistor System Abnormality Thermistor System Abnormality Thermistor System Abnormality Liquid Pipe Thermistor Abnormality Thermistor System Abnormality...
  • Page 74 Troubleshooting by Remote Controller Si20-701_B Model Name Error Contents of Error Code Overcurrent of DC Output (Instantaneous) Radiation Fin Temperature Rise Radiation Fin Temperature Rise Radiation Fin ∗6 Temperature Rise Overcurrent of DC Output (Instantaneous) Momentary Overcurrent ∗6 of Inverter Compressor Output Overcurrent Detection Inverter Compressor...
  • Page 75 Si20-701_B Troubleshooting by Remote Controller Model Name Error Contents of Error Code Transmission Error (between Control PCB ∗6 and Inverter PCB) Transmission Error (between Control PCB and Inverter PCB) Transmission Error (between Control PCB ∗4, 5 and Inverter PCB) Inverter Over-Ripple ∗6 Protection Transmission Error...
  • Page 76 Troubleshooting by Remote Controller Si20-701_B Model Name Error Contents of Error Code Refrigerant Shortage Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure Refrigerant Shortage ∗5 Refrigerant Shortage ∗4 Refrigerant Shortage ∗3 Reverse Phase ∗6 Reverse Phase Insufficient Voltage Power Supply Voltage Abnormality...
  • Page 77 Si20-701_B Troubleshooting by Remote Controller Model Name Error Contents of Error Code Transmission Error (Between Indoor Unit and Outdoor Unit) Transmission Error (Between Indoor Unit and Outdoor Unit) Transmission Error (Between Indoor Unit and Outdoor Unit) Transmission Error (Between Indoor Unit and ∗4, 5 Outdoor Unit) Transmission Error...
  • Page 78 Troubleshooting by Remote Controller Si20-701_B Model Name Error Contents of Error Code Transmission Error (Between Main Remote Controller and Sub Remote Controller) Transmission Error (Between Main Remote Controller and Sub Remote Controller) Transmission Error (Between Main Remote Controller and Sub Remote Controller) Transmission Error (Between Indoor and...
  • Page 79 Si20-701_B Troubleshooting by Remote Controller Model Name Error Contents of Error Code Transmission Error between Centralized Controller and Indoor Unit Transmission Error between Centralized ∗6 Controller and Indoor Unit System is not Set yet Transmission Error (Between Indoor and Outdoor Unit) / Piping and Wiring Mismatch / Refrigerant Shortage System is not Set yet...

  • Page 80: Detailed Error Codes

    Troubleshooting by Remote Controller Si20-701_B 3.3 Detailed Error Codes 3.3.1 Indoor Unit Troubleshooting Error code Description of error Description of diagnosis A6 - 01 Fan motor locked A locked fan motor current has been detected. Turn the fan by hand to check for the connection of connectors.
  • Page 81 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis AH - 07 Damper rotation error [when The damper does not rotate normally. Check for any the self-cleaning decoration foreign matters around the panel is mounted] damper and for the operation of the gear and limit switch.
  • Page 82 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Error code Description of error Description of diagnosis L8 - 01 Electronic thermal 1 error Overload current continues for a period of 260 seconds or more. This error is supposed to have resulted from excessive charging of refrigerant, damage caused to the compressor bearing, too high...
  • Page 83 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis L9 - 02 Stall prevention (startup error) The compressor has not completed startup operation. This error is supposed to have resulted from high startup differential pressure, liquid back, excessive compressor oil, abnormal compressor coil, seizure of...
  • Page 84 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Error code Description of error Description of diagnosis U0 - 03 Refrigerant shortage - This error results from a refrigerant shortage cause by Outdoor unit (Factor 1) gas leakage. Charge refrigerant up to the normal refrigerant amount.
  • Page 85 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis UA - 05 Indoor-Outdoor transmission There is an error in transmission between the error between slave 1 and outdoor unit and slave indoor outdoor unit unit 1. Check for the connection of the jumper between the slave indoor unit (with no remote controller...
  • Page 86 Troubleshooting by Remote Controller Si20-701_B Error of External Protection Device Remote Controller Display Applicable Models FCQ, FMCQ Method of Error Detection Detect open or short circuit between external input terminals in indoor unit. Error Decision Conditions When an open circuit occurs between external input terminals with the remote controller set to "external ON/ OFF terminal".
  • Page 87 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. External protection device is connected Actuation of to terminals T1 and T2 external of the indoor unit protection device.

  • Page 88: Abnormality

    Troubleshooting by Remote Controller Si20-701_B Indoor Unit PCB Abnormality Remote Controller Display Applicable Models All indoor models Method of Error Detection Check data from E²PROM. Error Decision Conditions The error is generated when the data from the E²PROM is not received correctly. E²PROM (Electrically Erasable Programmable Read Only Memory): A memory chip that holds its content without power.
  • Page 89 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Switch the power OFF and ON again to restart. Normal reset? Replace the indoor unit PCB. The error may be caused by an external factor,...
  • Page 90 Troubleshooting by Remote Controller Si20-701_B Drain Water Level System Abnormality Remote Controller Display Applicable Models FH(Y)C, FH(Y)K, FH(Y)B, FH(Y), FAY, FV(Y), FUY, FHC, FH, FDMG, FDBG, FDBT, FCQ(H), FMCQ, FFQ, FCQG, FHQ (option), FHQG, FAQ (option), FBQ, FDQ, FMDQ, Method of Error Detection By float switch OFF detection Error Decision Conditions The error is generated when the water level reaches its...
  • Page 91 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. the unit a cassette, corner or built-in type? Is the optional drain pump installed? Is a drain pump connected to the Connect the...
  • Page 92 Troubleshooting by Remote Controller Si20-701_B Is the float Connect the float switch connected ? switch. Remove the float switch, short circuit, and restart operation. Error Replace the float displayed again? switch. Replace the indoor unit PCB. Note: If "A3" is detected by a PCB without X15A, the PCB is defective.
  • Page 93 Si20-701_B Troubleshooting by Remote Controller Indoor Unit Fan Motor Abnormality Remote Controller Display Applicable Models FH(Y), FAY, FUY, FHC, FH, FDBG, FDBT, FDMG, FAQ100BU, FHQ-BU Method of Error Detection Detection by failure of signal for detecting number of turns to come from the fan motor Error Decision Conditions When number of turns cannot be detected even when output voltage to the fan is maximum...
  • Page 94 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. fan motor connectors properly Connect connected? correctly. With connectors unplugged and the power supply turned ON, is there Replace the about 12 VDC between indoor unit PCB.
  • Page 95 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models FCQ, FHQ, FAQ Method of Error Detection Detection of abnormal fan speed by signal from the fan motor Error Decision Conditions The error is generated when the rotation speed of the fan motor are not detected while the output voltage to the fan is at its maximum.
  • Page 96 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Turn OFF the power supply. Wait for 10 minutes. there any foreign Remove the matter around the foreign matter.
  • Page 97 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models Method of Error Detection Detection from the current flow on the fan PCB. Detection from the rotation speed of the fan motor in operation. Detection from the position signal of the fan motor. Detection from the current flow on the fan PCB when the fan motor starting operation.
  • Page 98 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Turn OFF the power supply. Wait for 10 minutes. There is a foreign Remove the matter around the foreign matter.
  • Page 99 Si20-701_B Troubleshooting by Remote Controller resistance between the power wire terminals of the fan Replace the fan motor and motor motor. frame (meal part) is 1 MΩ or below. Remove the power wire connector from the fan motor and measure the resistance between U and V, V and W, and W and U phases...
  • Page 100 Troubleshooting by Remote Controller Si20-701_B Turn ON the power. HAP lamp of the indoor unit Replace the fan PCB blinks and the PCB. HAP lamp of the fan PCB is OFF. Replace the fan motor.
  • Page 101 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models FDQ200 • 250 Method of Error Detection Detect the status in which the separate power supply for the fan is cut OFF. Error Decision Conditions Unable to detect that separate power supply for the indoor unit fan is turned ON Supposed Causes Defective power supply for the indoor unit fan motor...
  • Page 102 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the power supply for the indoor unit Connect fan correctly correctly. connected? Is the fan interlock Connect PCB correctly...
  • Page 103 Si20-701_B Troubleshooting by Remote Controller Fan Motor (M1F) Lock, Overload Remote Controller Display Applicable Models FMCQ, FMDQ Method of Error Detection Detection by failure of signal for detecting number of turns to come from the fan motor Error Decision Conditions When number of turns can not be detected even when output voltage to the fan is maximum Supposed Causes...
  • Page 104 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the wiring from the fan motor Connect the securely connected to wiring and turn connectors on the ON again.
  • Page 105 Si20-701_B Troubleshooting by Remote Controller Swing Flap Motor Abnormality / Lock Remote Controller Display Applicable Models FH(Y)C, FH(Y)K, FH(Y), FA(Y), FV(Y), FUY, FHC, FH, FDBG, FDBT, FDMG, FCQ(H), FMCQ, FFQ, FHQ, FAQ(except FAQ71BU), FBQ, FUQ, FVQ Method of Error Detection The error is detected by the limit switch when the motor turns.
  • Page 106 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the connector correctly Connect connected? correctly. Is the limit switch's transfer connector Connect correctly correctly.
  • Page 107 Si20-701_B Troubleshooting by Remote Controller 3.10 Abnormal Power Supply Voltage Remote Controller Display Applicable Models FCQ, FBQ, FMDQ-B7 Method of Error Detection Detect error checking the input voltage of fan motor. Error Decision Conditions When the input voltage of fan motor is 150V and below, or 386V and above.
  • Page 108 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check the condition of the power supply. Check if power supply voltage is 220V - 240V ±...
  • Page 109 Si20-701_B Troubleshooting by Remote Controller 3.11 Electronic Expansion Valve Coil (Y1E) Abnormality Remote Controller Display Applicable Models FMCQ, FMDQ Method of Error Detection Use a micro-computer to check the electronic expansion valve for coil conditions. Error Decision Conditions When the pin input of the electronic expansion valve is not normal while in the initialization of the micro- computer.
  • Page 110 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution electronic expansion valve is After connecting, connected to the turn the power indoor unit supply OFF and PCB.
  • Page 111 Si20-701_B Troubleshooting by Remote Controller ∗1: Coil check method for the electronic expansion valve coil Disconnect the electronic expansion valve from the PCB and check the continuity between the connector pins. (Normal) Pin No. 1. White 2. Yellow 3. Orange 4. Blue 5. Red 6. Brown 1.
  • Page 112 Troubleshooting by Remote Controller Si20-701_B 3.12 Drain System Abnormality Remote Controller Display Applicable Models FH(Y)C, FH(Y)K, FH(Y)B, FH(Y), FAY, FV(Y), FUY, FHC, FH, FDMG, FDBG, FDBT, FCQ(H), FFQ, FHQ, FAQ, FBQ, FDQ, FUQ Method of Error Detection Water leakage is detected based on float switch ON/OFF operation while the compressor is in non-operation.
  • Page 113 Si20-701_B Troubleshooting by Remote Controller Is the water drainage Clogged drain system normal? water discharge system Clogged drain pump Defective float switch Replace the indoor unit PCB. Check to see if drain-up height and horizontal pipe length exceed specifications. ∗ In FHY, FAY, and FHQ problems can also occur in the optional drain pump.
  • Page 114 Troubleshooting by Remote Controller Si20-701_B 3.13 Drain Level above Limit Remote Controller Display Applicable Models FMCQ, FMDQ Method of Error Detection Water leakage is detected based on float switch ON/OFF operation while the compressor is in non-operation. Error Decision Conditions When the float switch changes from ON to OFF while the compressor is in non-operation.
  • Page 115 Si20-701_B Troubleshooting by Remote Controller 3.14 Capacity Setting Abnormality Remote Controller Display Applicable Models FH(Y)C, FH(Y)K, FH(Y)B, FH(Y), FAY, FV(Y), FUY, FHC, FH, FDBG, FDBT, FDMG Method of Error Detection Capacity is determined according to resistance of the capacity setting adaptor and the memory inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is determined.
  • Page 116 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the capacity setting adaptor plugged into Plug a capacitor the connector of the setting adaptor indoor unit that matches the PCB?
  • Page 117 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models FCQ(H), FFQ, FDQ, FHQ, FAQ, FUQ, FVQ Method of Error Detection Capacity is determined according to resistance of the capacity setting adaptor and the memory inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is determined.
  • Page 118 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the capacity setting adaptor connected to the indoor unit PCB? Install a capacitor setting adaptor that matches the capacity of the indoor unit.
  • Page 119 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Application Models FBQ, FMDQ, FAQ-BU, FCQ-C7, FMCQ, FFQ-B, FHQ-B, Error Decision Conditions Operation and: When the capacity code is not saved to the PCB, and the capacity setting adaptor is not connected. Supposed Causes Defective capacity setting adaptor connection Defective indoor unit PCB...
  • Page 120 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models FCQG, FHQG Method of Error Detection Capacity is determined according to resistance of the capacity setting adaptor and the memory inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is determined.
  • Page 121 Si20-701_B Troubleshooting by Remote Controller Capacity setting adaptor The capacity is set in the PCB’s memory IC. A capacity setting adaptor that matches the capacity of the unit is required in the following case: In case the indoor unit PCB installed at the factory is for some reason changed at the installation site, the capacity will not be contained in the replacement PCB.
  • Page 122 Troubleshooting by Remote Controller Si20-701_B 3.15 Transmission Error (between Indoor Unit PCB and Fan PCB) Remote Controller Display Applicable Models FBQ, FMDQ Method of Error Detection Check the condition of transmission between indoor unit PCB and fan PCB using computer. Error Decision Conditions When normal transmission is not conducted for certain duration.
  • Page 123 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the connector between indoor Connect the unit PCB and fan PCB connector accurately accurately. connected? (∗1) Confirm the condition of...
  • Page 124 Troubleshooting by Remote Controller Si20-701_B ∗2. Method to check transmission part of indoor unit PCB. 1 Turn OFF the power and remove the connecter X70A of indoor unit PCB. 2 Short circuit X70A. 3 After turning ON the power, check below numbers under local setting remote control.
  • Page 125 Si20-701_B Troubleshooting by Remote Controller 3.16 Transmission Error (between Indoor Unit PCB and Adaptor PCB) Remote Controller Display Applicable Models FCQG Method of Error Detection Check the condition of transmission between indoor unit PCB and adaptor PCB using micro-computer. Error Decision Conditions When normal transmission is not conducted for certain duration (15 seconds or more).
  • Page 126 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the connection of connector on indoor Connect the unit PCB normal? connector accurately. Is the connection of Connect the connector on adaptor...
  • Page 127 Si20-701_B Troubleshooting by Remote Controller Error is Normal displayed again? operation. Check the panel PCB and indoor unit PCB.
  • Page 128 Troubleshooting by Remote Controller Si20-701_B 3.17 Thermistor Abnormality Remote Controller Display C4, C5, C9 Applicable Models FH(Y)C, FH(Y)K, FH(Y)B, FH(Y), FAY, FV(Y), FUY, FHC, FH, FDBG, FDBT, FDMG, FCQ(H), FMCQ, FFQ, FHQ, FAQ, FBQ,FDQ, FMDQ, FUQ, FVQ, FCQG, FHQG Method of Error Detection The error is detected by temperature detected by thermistor.
  • Page 129 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check the connector connection. Is it Correct the normal? connection. CHECK 3 Check Replace the the thermistor thermistor.
  • Page 130 Troubleshooting by Remote Controller Si20-701_B 3.18 Defective Combination (between Indoor Unit PCB and Fan PCB) Remote Controller Display Applicable Models FBQ, FMDQ-B7 Method of Error Detection Conduct open line detection with fan PCB using indoor unit PCB. Error Decision Conditions When the communication data of fan PCB is determined as incorrect.
  • Page 131 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the type Replace it with of fan PCB correct? correct fan PCB. indoor unit PCB (A1P) replaced with a spare PCB?
  • Page 132 Troubleshooting by Remote Controller Si20-701_B 3.19 Humidity Sensor System Abnormality Remote Controller Display Applicable Models FCQ(H) Method of Error Detection The error is detected by humidity detected by humidity sensor. Error Decision Conditions The error is generated when the humidity sensor becomes disconnected or shorted when the unit is running.
  • Page 133 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models FCQ-C7, FCQG, FMCQ Method of Error Detection Even if an error occurs, operation still continues. Error is detected according to the moisture (output voltage) detected by the moisture sensor. Error Decision Conditions When the moisture sensor is disconnected or short circuited Supposed Causes...
  • Page 134 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Remove the humidity sensor from the indoor unit PCB and insert it again. Does it function It is normal.
  • Page 135 Si20-701_B Troubleshooting by Remote Controller 3.20 Remote Controller Thermistor Abnormality Remote Controller Display Applicable Models FHY, FHYC, FUY, FAY, FV(Y) (Available for 2 remote controller use.), FHC, FH, FDBG, FDBT, FDMG, FCQ(H), FMCQ, FFQ, FHQ, FAQ, FBQ, FDQ, FMDQ, FUQ, FVQ, FCQG, FHQG Method of Error Detection Even if remote controller thermistor is defective, system...
  • Page 136 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Turn OFF the power supply and turn the power The error is Replace the displayed again. remote controller.
  • Page 137 Si20-701_B Troubleshooting by Remote Controller 3.21 Actuation of Safety Device Remote Controller Display Applicable Models RY-F/FU, R(Y)-G/GA/KU Method of Error Detection Actuation of each safety device is detected by safety device input circuit. (Safety device unified detection) Supposed Causes <Causes related to PCB> Defective outdoor unit PCB Defective safety device input connection Safety device’s harness is broken or disconnected...
  • Page 138 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the safety device's lead wire Connect correctly connected to correctly. the outdoor unit PCB? Find safety device which is not energized.
  • Page 139 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models R-NU/PU Method of Error Detection Actuation of each safety device is detected by safety device input circuit. (Safety device unified detection) Supposed Causes <Causes related to safety devices> Defective safety device input connection Safety device’s harness is broken or disconnected <Causes related to product as a whole>...
  • Page 140 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the safety device's lead wire Connect correctly connected to correctly. the outdoor unit PCB? Find safety device which the contact is open.
  • Page 141 Si20-701_B Troubleshooting by Remote Controller Reverse phase power supply. Is the power supply Change the phase correct? phase if the power supply is not correct. Low pressure switch activation. Is the stop valve fully Open the stop opened? valve. Is the refrigerant Replace the piping circuit clogged? clogged part.
  • Page 142 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Model R(Y)-LU, RR-M Method of Error Detection Actuation of each safety device is detected with safety device input circuit. (Unified detection of actuation of each safety device) Possible Causes Defective input connection of safety device Defective harness of safety device Stop valve is not opened Clogged refrigerant piping system...
  • Page 143 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check for the installation conditions. Is the safety device's lead wire Connect correctly connected to correctly.
  • Page 144 Troubleshooting by Remote Controller Si20-701_B Note: ∗1. In the case of R(Y)71, or 100, make sure the short circuiting connector is correctly mounted. ∗2. R(Y)71, and 100LU, are provided with a safety device for errors in the compressor. If the compressor errors due to closed stop valve or refrigerant shortage, this safety device may be actuated.
  • Page 145 Si20-701_B Troubleshooting by Remote Controller 3.22 Activation of Outdoor Unit Protection Device Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Motor abnormality is detected when the temperature of outdoor unit fan motor coil rises excessively due to motor seizing or other reason and the thermal switch turns OFF.
  • Page 146 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Are the connectors Connect the connected to the connector, and outdoor unit operate the unit. PCB? Is the Q1L fan...
  • Page 147 Si20-701_B Troubleshooting by Remote Controller 3.23 Outdoor Unit PCB Abnormality Remote Controller Display Applicable Model R(Y)-LU, RR-M Method of Error Detection A micro-computer checks whether or not E PROM is normal. Error Decision Conditions When E PROM error when turning the power supply ON Possible Causes Defective outdoor unit PCB Troubleshooting...
  • Page 148 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models CMSQ Method of Error Detection Check data from E²PROM Error Decision Conditions When data could not be correctly received from the E²PROM E²PROM : Type of nonvolatile memory. Maintains memory contents even when the power supply is turned OFF.
  • Page 149 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG-L, RZR-KU/HU Method of Error Detection Micro-computer checks whether E PROM is normal. Error Decision Conditions When E PROM error when turning the power supply ON Supposed Causes Defective outdoor unit PCB Troubleshooting Be sure to turn off the power switch before...
  • Page 150 Troubleshooting by Remote Controller Si20-701_B 3.24 High Pressure System Abnormality Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU Method of Error Detection Continuity of the high pressure switch is detected by the safety device circuitry. Error Decision Conditions Case where high pressure switch is actuated when the compressor is operating Supposed Causes <Causes related to PCB>...
  • Page 151 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. HPS's for control and safety connected to the Connect correctly outdoor unit PCB? (∗1) Turn OFF the power supply and check the following after letting the compressor rest for 2 or 3...
  • Page 152 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models R(Y)-LU, RR-M Method of Error Detection Continuity of the high pressure switch is detected by the safety device circuitry. Error Decision Conditions Case where high pressure switch is actuated when the compressor is operating Supposed Causes <Causes related to PCB>...
  • Page 153 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check the installation condition. the stop valve Open the stop opened? valves. HPS's for control and safety connected to the Connect outdoor unit...
  • Page 154 Troubleshooting by Remote Controller Si20-701_B Display Replace the high error "H3" code. pressure switch. Replace the outdoor unit PCB. Note: ∗1. Some models are not equipped with an HPS for control or safety.
  • Page 155 Si20-701_B Troubleshooting by Remote Controller 3.25 Abnormally High Pressure Level (HPS) Remote Controller Display Applicable Models RZ(Y) Method of Error Detection The error is detected when the contact of the high pressure protection switch opens. Error Decision Conditions The error is generated when the HPS activation count reaches the number specific to the operation mode.
  • Page 156 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is protection HPS connected to Correct the outdoor unit connection. PCB? Turn OFF the power. Wait 2 to 3 minutes after compressor stops operating, then check the...
  • Page 157 Si20-701_B Troubleshooting by Remote Controller 3.26 High Pressure Abnormality (HPS) Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection The protection device circuit checks continuity in the high pressure switch. Error Decision Conditions When the high pressure switch is actuated Supposed Causes Defective high pressure switch Disconnection in high pressure switch harness...
  • Page 158 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check the installation conditions. Is the stop Open the stop valve open? valve. control and protection high Connect pressure switch...
  • Page 159 Si20-701_B Troubleshooting by Remote Controller the error “H3” Replace the high displayed? pressure switch. Except RZQ-C Replace the outdoor unit RZQ-C PCB. CHECK 4 The pressure is Correct the abnormally failure. high. Check "Refrigerant overcharge" CHECK 10 Replace the outdoor unit PCB (A1P).
  • Page 160 Troubleshooting by Remote Controller Si20-701_B 3.27 Actuation of High Pressure Switch Remote Controller Display Applicable Models CMSQ Method of Error Detection Abnormality is detected when the contact of the high pressure protection switch opens. Error Decision Conditions Error is generated when the HPS activation count reaches the number specific to the operation mode.
  • Page 161 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check for the points shown below. (1) Is the stop valve open? (2) Is the high pressure switch connector properly connected to the main outdoor unit PCB? (3) Does the high pressure switch have continuity? Are the 3...
  • Page 162 Troubleshooting by Remote Controller Si20-701_B · The high pressure sensor is normal, and the pressure detected with the PCB is also normal. · The high pressure has really become high. Remove the causes by which the high CHECK 14 pressure has become high. Note: ∗1: Make a comparison between the voltage of the pressure sensor and that read by the pressure gauge.
  • Page 163 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQG71, 100L Method of Error Detection [In cooling] The error is detected by the outdoor unit intermediate heat exchanger thermistor (R5T). [In heating] The error is detected by the indoor unit intermediate heat exchanger thermistor (R3T).
  • Page 164 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution [In cooling] characteristics of the outdoor unit Replace the intermediate outdoor unit thermistor intermediate heat normal? exchanger thermistor.
  • Page 165 Si20-701_B Troubleshooting by Remote Controller [In heating] characteristics of the indoor unit Replace the intermediate indoor unit thermistor intermediate heat normal? exchanger thermistor. indoor unit fan is Remove the rotating during foreign matter. operation. Replace the fan motor. Are the operation of Troubleshooting electronic expansion...
  • Page 166 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQG125, 140L Method of Error Detection [In cooling] Detect the continuity of high pressure switch (S1PH) with the protection device circuit. The error is detected by the outdoor unit intermediate heat exchanger thermistor (R5T).
  • Page 167 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the stop Open the stop valve open? valve. Are the connection of the connector on Correctly PCB and the connect.
  • Page 168 Troubleshooting by Remote Controller Si20-701_B [In cooling] [In heating] characteristics of the outdoor unit Replace the intermediate outdoor unit thermistor intermediate heat normal? exchanger thermistor. characteristics of the indoor unit Replace the intermediate indoor unit thermistor intermediate heat normal? exchanger thermistor.
  • Page 169 Si20-701_B Troubleshooting by Remote Controller 3.28 Low Pressure System Abnormality Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU/LU, RR-M Method of Error Detection Continuity of the low pressure switch is detected by the safety device circuitry. Error Decision Conditions Case where low pressure switch is actuated when the compressor is operating Supposed Causes <Causes related to PCB>...
  • Page 170 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. R(Y)-LU series? Check the installation condition. the stop Open the stop valve opened? valves. Is low pressure sensor for safety Connect...
  • Page 171 Si20-701_B Troubleshooting by Remote Controller 3.29 Actuation of Pressure Sensor Remote Controller Display Applicable Models RZQ-K, RZQ(S)-C, RZQG-L, RZR-KU/HU Method of Error Detection For except RZQG [In cooling] Detect error by the pressure sensor. [In heating] Detect error by the intermediate heat exchanger thermistor.
  • Page 172 Troubleshooting by Remote Controller Si20-701_B Defective outdoor unit PCB Abnormal drop of low pressure (Inadequate refrigerant) (Defective refrigerant piping system (liquid pipe system)) (Defective electronic expansion valve) Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
  • Page 173 Si20-701_B Troubleshooting by Remote Controller Is the pressure sensor properly connected to Connect the the outdoor unit connector PCB? properly. Remove the thermistor from the outdoor unit PCB RZQG and measure resistance. except RZQG Is it normal? Replace the CHECK 6 group CHECK 7 thermistor.
  • Page 174 Troubleshooting by Remote Controller Si20-701_B Is low-pressure Replace the abnormally low? outdoor unit CHECK 5 PCB. Replace the PCB equipped with resin case. Correct the refrigerant system defect. Refer to P.466. CHECK 5...
  • Page 175 Si20-701_B Troubleshooting by Remote Controller 3.30 Actuation of Low Pressure Sensor Remote Controller Display Applicable Models CMSQ Method of Error Detection Abnormality is detected by the pressure value with the low pressure sensor. Error Decision Conditions Error is generated when the low pressure drops while the compressor is in operation.
  • Page 176 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution the stop valve Open the stop open? valve. (1) Mount a pressure gauge on the low pressure service port.
  • Page 177 Si20-701_B Troubleshooting by Remote Controller Note: ∗1. Make a comparison between the voltage of the pressure sensor and that read by the pressure gauge. (As to the voltage of the pressure sensor, make measurement of voltage at the connector, and then convert it to pressure.
  • Page 178 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ-H, RZQ(S)-B Method of Error Detection The protection device circuit checks continuity in the low pressure switch. Error Decision Conditions When the low pressure switch is activated during compressor operating. Operating pressure: 0.12 MPa continuous 5 minutes Supposed Causes ∗...
  • Page 179 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check the installation conditions. the stop valve Open the stop opened? valve. Is the connector for the low pressure Connect switch properly...
  • Page 180 Troubleshooting by Remote Controller Si20-701_B 3.31 Low Pressure System Abnormality Remote Controller Display Applicable Models RZQ-C Method of Error Detection Detect errors by the low pressure sensor. Error Decision Conditions When the detection pressure is the following value Actuating pressure: 0.07MPa Supposed Causes Defective low pressure switch Disconnection of the wire harness of the low pressure...
  • Page 181 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the installation conditions the stop valve Open the stop open? valve. connector (∗1) for the low pressure Connect sensor correctly correctly.
  • Page 182 Troubleshooting by Remote Controller Si20-701_B ∗1: Connector code: X31A ∗2: Method of voltage measurement Outdoor unit PCB A1P Connector Black Micro-computer White A/D input Measure voltage here. ∗3: Pressure/ voltage characteristic of the sensor -0.5 -0.5 Output voltage V PL=0.57V-0.28 PL: detected pressure (Mpa) V: output voltage (V)
  • Page 183 Si20-701_B Troubleshooting by Remote Controller 3.32 Compressor Motor Lock Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection Inverter PCB takes the position signal from UVWN line connected between the inverter and compressor, and detects the position signal pattern. Error Decision Conditions The position signal with 3 times cycle as imposed frequency is detected when compressor motor operates...
  • Page 184 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check the installation conditions. Is the stop Open the stop valve open? valve. RZQ-C Is the UVWN wiring Connect normal?
  • Page 185 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models CMSQ Method of Error Detection Inverter PCB takes the position signal from UVW line connected between the inverter and compressor, and the error is detected when any abnormality is observed in the phase-current waveform.
  • Page 186 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the stop Onsite causes. valve open? Open the stop valve. Check the compressor cable for disconnection and flaws.
  • Page 187 Si20-701_B Troubleshooting by Remote Controller Disconnect the cable from the compressor, and then check the compressor for the insulation resistance. insulation resistance is low Replace the (i.e., not more than compressor. 100kΩ.) Check the compressor motor coil for any broken wire.
  • Page 188 Troubleshooting by Remote Controller Si20-701_B 3.33 Compressor Overcurrent Remote Controller Display Applicable Model R(Y)-LU, RR-M Method of Error Detection The input current value is detected with a current sensor. Error Decision Conditions When the compressor input current exceeds the specified input current value. ∗...
  • Page 189 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check for the installation conditions. Is the stop Open the stop valve open? valve. CHECK 4 Correct the high High pressure is pressure.
  • Page 190 Troubleshooting by Remote Controller Si20-701_B ∗1. Approximate Input current value Input current Input current Model Model value value R71LUVAL 25.30 A RR71MV1 25.3 A R(Y)71LUV1 25.30 A RR71MY1 11.5 A R(Y)71LUY1 8.63 A RR100MY1 11.5 A R100LUVAL 29.90 A RR125MY1 15.0 A R(Y)100LUV1 29.90 A...
  • Page 191 Si20-701_B Troubleshooting by Remote Controller 3.34 Outdoor Unit Fan Motor Abnormality Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG, RZR-KU/HU Method of Error Detection Abnormality of fan motor system is detected according to the fan speed detected by hall IC when the fan motor runs.
  • Page 192 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. the supply voltage within the Ask repair so that range (V1: 220-240V, the supply Y4A: 380- voltage will be 415V)? within the normal...
  • Page 193 Si20-701_B Troubleshooting by Remote Controller Is the resistance value Replace the fan of the fan motor motor. normal? Does the Replace the fuse. fuse have continuity? Properly plug the fan motor connector and then turn ON the power again. The error is Replace the displayed again.
  • Page 194 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ-C7 Method of Error Detection Defective fan motor system is detected according to the fan speed detected by hall IC when the fan motor runs. Error Decision Conditions When the fan runs with speed less than a specified one for 6 seconds or more when the fan motor running conditions are met When connector detecting fan speed is disconnected...
  • Page 195 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Cut the power supply to wait for 10 minutes. There is a foreign substance found Remove the around the object foreign...
  • Page 196 Troubleshooting by Remote Controller Si20-701_B continuity on the Replace the fan fan inverter PCB inverter PCB. fuse Unable to rotate the fan manually with ease Replace the when removing the corresponding connector of the fan motor. fan motor resistance value between the power supply wire terminal of fan Replace the...
  • Page 197 Si20-701_B Troubleshooting by Remote Controller CHECK 1 Check the fan motor connector (signal wire) signal wire short circuits Replace the between Vcc and corresponding GND / UVW fan motor. and GND Put the power supply ON to check the following LED lamps: HAP lamp above the compressor inverter PCB...
  • Page 198 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models CMSQ Method of Error Detection Error of fan motor system is detected according to the fan speed detected by hall IC when the fan motor runs. Error Decision Conditions When the fan runs with speed less than a specified one for 6 seconds or more when the fan motor running conditions are met When connector detecting fan speed is disconnected...
  • Page 199 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Turn OFF the power supply, and then wait for a period of 10 minutes. there any foreign matters Remove the around the...
  • Page 200 Troubleshooting by Remote Controller Si20-701_B Connectors of harness between the compressor Insert the inverter PCB and the connectors in the fan inverter PCB are harness. disconnected. fuse (white tubular fuse) on the fan Replace the fan inverter PCB has a inverter PCB.
  • Page 201 Si20-701_B Troubleshooting by Remote Controller CHECK 2 Check for the fan motor connector (Power supply cable) Resistance of the U, V, and W phases of the fan motor has got Replace the imbalanced or short outdoor unit fan circuits have been motor.
  • Page 202 Troubleshooting by Remote Controller Si20-701_B Turn ON the power supply. (HAP) on the compressor inverter PCB is Replace the fan blinking, but the LED inverter PCB. (HAP) on the fan inverter PCB is not blinking. Replace the outdoor unit fan motor.
  • Page 203 Si20-701_B Troubleshooting by Remote Controller 3.35 Electronic Expansion Valve Abnormality Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU/LU Method of Error Detection With electronic expansion valve error detection, coil current is detected and open and short circuits are detected. Error Decision Conditions The error is determined by the following condition.
  • Page 204 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Turn the power supply OFF once and then restart. Normal reset? External factor (Noise, etc.). Is the electronic expansion valve coil...
  • Page 205 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZ(Y), RZQ-C Method of Error Detection For RZ(Y) The error detection function detects coil current to determine open circuit and short circuit. For RZQ-C Check disconnection of connector Check continuity of electronic expansion valve coil Error Decision Conditions For RZ(Y) Error is generated under the following condition.
  • Page 206 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. electronic expansion valve Correct the connector connection. disconnected? Turn OFF the power supply and turn the power Does the External factor unit reset?
  • Page 207 Si20-701_B Troubleshooting by Remote Controller 3.36 Electronic Expansion Valve Coil Abnormality Remote Controller Display Applicable Models CMSQ Method of Error Detection Check disconnection of connector Check continuity of electronic expansion valve coil Error Decision Conditions Error is generated under no common power supply when the power is ON.
  • Page 208 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Turn the power supply OFF, and turn the power supply ON again. Return to External factor normal? other than error (for example,...
  • Page 209 Si20-701_B Troubleshooting by Remote Controller Note: ∗1. Make measurement of resistance between the connector pins, and then make sure the resistance falls in the range of 40 to 50Ω. (Orange) 1 (Red) 2 Measuring points (Yellow) 3 1 - 6 2 - 6 (Black) 4 3 - 6...
  • Page 210 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ-K, RZQ(S)-B, RZQG, RZR-KU/HU Method of Error Detection The error is detected by the suction pipe superheated degree and electronic expansion valve opening degree calculated by values of pressure sensor and suction pipe thermistor.
  • Page 211 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Turn OFF the power supply and turn the power error is displayed again. Is the electronic expansion valve Connect...
  • Page 212 Troubleshooting by Remote Controller Si20-701_B Is the temperature sensor of each thermistor (suction pipe, discharge pipe, intermediate heat Mount properly. exchanger and heat exchanger distributor pipe thermistors) mounted properly? Are the characteristics of each thermistor Replace the normal? defective thermistor. CHECK 3 Are the pressure sensor...
  • Page 213 Si20-701_B Troubleshooting by Remote Controller Actually, it is in wet operation. Refer to CHECK 9 eliminate the causes of wet operation. Restart operation. The error is Replace the displayed again. outdoor unit PCB. External factor (Noise, etc.) Refer to P.474. CHECK 9...
  • Page 214 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ-H, RZQ(S)-C Method of Error Detection The error is detected by the suction pipe superheated degree and electronic expansion valve opening degree calculated by values of suction pipe thermistor. Error Decision Conditions When the following conditions are met for 10 minutes Suction pipe superheated degree <...
  • Page 215 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Turn OFF the power supply and turn the power error is displayed again. Is the electronic expansion valve connector properly...
  • Page 216 Troubleshooting by Remote Controller Si20-701_B Is the temperature sensor of each thermistor (suction pipe, discharge pipe Mount properly. and heat exchanger distributor pipe thermistors) mounted properly? CHECK 3 Are the Replace the characteristics of each defective thermistor thermistor. normal? Actually, it is in wet operation.
  • Page 217 Si20-701_B Troubleshooting by Remote Controller 3.37 Discharge Pipe Temperature Abnormality Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU Method of Error Detection The error is detected according to temperature detected by discharge pipe thermistor. Error Decision Conditions When discharge pipe temperature becomes abnormally high When discharge pipe temperature rises suddenly When the discharge pipe thermistor comes out of its...
  • Page 218 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the amount of Charge with the refrigerant proper amount of correct? refrigerant. the thermistor come off the Correctly place discharge pipe...
  • Page 219 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models R(Y)-LU, RR-M Method of Error Detection The error is detected according to temperature detected by discharge pipe thermistor. Error Decision Conditions When discharge pipe temperature becomes abnormally high When discharge pipe temperature rises suddenly When the discharge pipe thermistor comes out of its installed position Supposed Causes...
  • Page 220 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. the thermistor Correctly place come off the discharge the discharge pipe port? pipe thermistor. Has the compressor lead wire Correct the lack lack of phase?
  • Page 221 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZ(Y) Method of Error Detection The error is detected according to the temperature detected by the discharge pipe thermistor. Error Decision Conditions When the discharge pipe temperature rises to an abnormally high level When the discharge pipe temperature rises suddenly Supposed Causes...
  • Page 222 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. discharge pipe Error in temperature 123.5ºC refrigerant or higher? system, such as refrigerant shortage and defective compressor.
  • Page 223 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models CMSQ Method of Error Detection Abnormality is detected according to the temperature detected by the discharge pipe temperature sensor. Error Decision Conditions When the discharge pipe temperature rises to an abnormally high level When the discharge pipe temperature rises suddenly Supposed Causes...
  • Page 224 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Discharge pipe temperature is Refrigerant 115˚C or higher when shortage, the unit stop by compression error.

  • Page 225: Temperature Control

    Si20-701_B Troubleshooting by Remote Controller 3.38 Discharge Pipe Temperature Control Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG, RZR-KU / HU Method of Error Detection The error is detected according to the temperature detected by the discharge pipe thermistor. Error Decision Conditions When the discharge pipe temperature rises to an abnormally high level When the discharge pipe temperature rises suddenly...
  • Page 226 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the discharge pipe Abnormality in temperature refrigerant system high? such as refrigerant shortage, defective compressor, etc.
  • Page 227 Si20-701_B Troubleshooting by Remote Controller 3.39 Abnormal Heat Exchanging Temperature Remote Controller Display Applicable Model R(Y)71~100LU Method of Error Detection The high pressure control (stop) is made according to temperature detected with outdoor unit heat exchanger thermistor in cooling operation or indoor unit heat exchanger thermistor in heating operation.
  • Page 228 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check for the installation conditions. Is the stop Open the stop valve open? valve. CHECK 4 Correct the high High pressure pressure.
  • Page 229 Si20-701_B Troubleshooting by Remote Controller 3.40 Refrigerant Overcharged Remote Controller Display Applicable Models CMSQ Method of Error Detection Excessive charging of refrigerant is detected by using the outdoor air temperature, heat exchanger deicer temperature and liquid pipe temperature during check operation.
  • Page 230 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the mounting condition of the outdoor air thermistor, heat exchanger deicer thermistor and liquid pipe thermistor in the piping.
  • Page 231 Si20-701_B Troubleshooting by Remote Controller 3.41 High Pressure Switch Abnormality Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU Method of Error Detection Continuity of the high pressure switch is detected by the safety device circuitry. Error Decision Conditions When the compressor is OFF and the high pressure switch does not have continuity Supposed Causes Defective high pressure switch...
  • Page 232 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Are high pressure switch for control and safety Connect correctly connected to the outdoor unit PCB? Check the following after letting rest for 2 or 3...
  • Page 233 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Model R(Y)125 • 140LU Method of Error Detection The protection device circuit checks for the continuity in the high pressure switch. Error Decision Conditions When the high pressure switch has no continuity during the compressor stops operating.
  • Page 234 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the connector of high pressure switch Connect correctly connected correctly. to the outdoor unit PCB? Wait for 10 minutes after the unit stops operating, then proceed to the...
  • Page 235 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZ(Y) Method of Error Detection The protection device circuit checks continuity in the high pressure switch. Error Decision Conditions When there is no continuity in the high pressure switch during compressor non-operating period. Supposed Causes Defective high pressure switch Open circuit in high pressure switch harness...
  • Page 236 Troubleshooting by Remote Controller Si20-701_B 3.42 High Pressure Switch System Abnormality Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG, RZR-KU/HU Method of Error Detection The protection device circuit checks continuity in the high pressure switch. Error Decision Conditions When there is no continuity in the high pressure switch during compressor stops operating.
  • Page 237 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. protection high pressure switch connector Connect correctly connected correctly. to outdoor unit PCB? Wait for 10 minutes after the unit stops operating, then check the following.
  • Page 238 Troubleshooting by Remote Controller Si20-701_B 3.43 Low Pressure Sensor System Abnormality Remote Controller Display Applicable Models RZQ-H Method of Error Detection Check the continuity of low pressure sensor Low pressure sensor is not operated when the low pressure is dropped under specific pressure (0.12MPa).
  • Page 239 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is low pressure sensor connector connected Connect to outdoor unit correctly. PCB? Turn OFF the power supply.
  • Page 240 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ-B Method of Error Detection Check the continuity of LPS LPS is not operated when the low pressure is dropped under specific pressure (0.12MPa). Error Decision Conditions When there is no continuity in the LPS during compressor start operating.
  • Page 241 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution connector Connect connected to outdoor correctly. unit PCB? Turn OFF the power supply. After 10 minutes, check the following.
  • Page 242 Troubleshooting by Remote Controller Si20-701_B 3.44 Outdoor Unit Fan Motor Signal Abnormality Remote Controller Display Applicable Models CMSQ, RZQ-C7 Method of Error Detection Detection of abnormal signal from fan motor. Error Decision Conditions In case of detection of abnormal signal at starting fan motor.
  • Page 243 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Turn power OFF. Is the fan motor connector Connect connected to PCB for correctly. fan inverter correctly? Check connector of fan motor.
  • Page 244 Troubleshooting by Remote Controller Si20-701_B 3.45 Thermistor System Abnormality Remote Controller Display H9, J3, J5, J6, J7, J8 Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection The error is detected according to the temperature detected by each individual thermistor. Error Decision Conditions When thermistor is disconnected or short-circuited during operation...
  • Page 245 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check connectors for connection. Connect Normal? correctly. Remove thermistor from outdoor unit PCB, then measure the resistance using a tester.
  • Page 246 Troubleshooting by Remote Controller Si20-701_B 3.46 Outdoor Air Thermistor System Abnormality Remote Controller Display Applicable Models RY-F/FU, R(Y)-G/GA/KU/LU, RR-M Error Decision Conditions Case where the outdoor air thermistor has a short or open circuit Supposed Causes Defective outdoor air thermistor Defective outdoor air thermistor connector connection Defective outdoor unit PCB Troubleshooting...
  • Page 247 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZ(Y), CMSQ Method of Error Detection The detection is based on abnormal resistance value of the thermistor. Error Decision Conditions When the outdoor air thermistor has short circuit or open circuit.
  • Page 248 Troubleshooting by Remote Controller Si20-701_B 3.47 Pressure Sensor Abnormality Remote Controller Display Applicable Models RZQ-K, RZQ(S)-C, RZR-KU/HU Method of Error Detection The error is detected by the pressure measured with pressure sensor Error Decision Conditions When the detect pressure becomes following; •...
  • Page 249 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check if the connector for the pressure sensor is correctly connected to the outdoor unit PCB. Is it Connect connected correctly?
  • Page 250 Troubleshooting by Remote Controller Si20-701_B 3.48 Current Sensor System Abnormality Remote Controller Display Applicable Model R(Y)-LU, RR-M Method of Error Detection The error of current sensor is detected through the current detected with the current sensor. Error Decision Conditions While in operation: When the current detected with the current sensor is not more than a constant value (1.5A).
  • Page 251 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Turn the power supply OFF. Is the applied model R(Y)71 or 100? Check the compressor for continuity.
  • Page 252 Troubleshooting by Remote Controller Si20-701_B 3.49 Discharge Pipe Thermistor System Abnormality Remote Controller Display Applicable Models RY-F/FU, R(Y)-G/GA/KU/LU, RR-M Error Decision Conditions Case where the discharge pipe thermistor has a short or open circuit Supposed Causes Defective discharge pipe thermistor Defective discharge pipe thermistor’s connector connection Defective outdoor unit PCB...
  • Page 253 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZ(Y), CMSQ Method of Error Detection The error is detected whether the resistance of thermistor is abnormal or normal. Error Decision Conditions When a short circuit or an open circuit in the discharge pipe thermistor is detected.
  • Page 254 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Connector is connected to the Connect outdoor unit PCB. thermistor and restart operation. Resistance measured after remove thermistor Replace the from outdoor unit PCB is...
  • Page 255 Si20-701_B Troubleshooting by Remote Controller 3.50 Suction Pipe Thermistor Abnormality Remote Controller Display Applicable Models CMSQ Method of Error Detection The error is detected from the temperature detected by the suction pipe thermistor. Error Decision Conditions When a short circuit or an open circuit in the suction pipe thermistor is detected.
  • Page 256 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Connector is connected to the Connect the outdoor unit connector and PCB. turn ON again. Resistance is normal when measured after...
  • Page 257 Si20-701_B Troubleshooting by Remote Controller 3.51 Heat Exchanger Thermistor System Abnormality Remote Controller Display Applicable Models RY-F/FU, R(Y)-G/GA/KU/LU, RR-M Error Decision Conditions Case where the heat exchanger thermistor has a short or open circuit Supposed Causes Defective heat exchanger thermistor Defective heat exchanger thermistor’s connector connection Defective outdoor unit PCB...
  • Page 258 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZ(Y), CMSQ Method of Error Detection The error is detected whether the resistance of thermistor is abnormal or normal. Error Decision Conditions When a short circuit or an open circuit in the outdoor air thermistor is detected.
  • Page 259 Si20-701_B Troubleshooting by Remote Controller 3.52 Liquid Pipe Thermistor Abnormality Remote Controller Display Applicable Models CMSQ Method of Error Detection The error is detected according to the temperature detected by liquid pipe thermistor. Error Decision Conditions When the liquid pipe thermistor is short circuited or open circuited Supposed Causes Defective liquid pipe thermistor (R6T)
  • Page 260 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the connector for liquid pipe Connect the thermistor connected connector and to the outdoor operate the unit unit PCB? again.
  • Page 261 Si20-701_B Troubleshooting by Remote Controller 3.53 Subcooling Heat Exchanger Gas Pipe Thermistor Abnormality Remote Controller Display Applicable Models CMSQ Method of Error Detection The error is detected according to the temperature detected by subcooling heat exchanger gas pipe thermistor. Error Decision Conditions When the subcooling heat exchanger gas pipe thermistor is short circuited or open circuited.
  • Page 262 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the connector for subcooling heat exchanger gas pipe Connect the thermistor connected connector and to the outdoor operate the unit unit PCB?
  • Page 263 Si20-701_B Troubleshooting by Remote Controller 3.54 High Pressure Sensor Abnormality Remote Controller Display Applicable Models RZQ, CMSQ Method of Error Detection The error is detected from the pressure detected by the high pressure sensor. Error Decision Conditions When the high pressure sensor is short circuit or open circuit Supposed Causes Defective high pressure sensor...
  • Page 264 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution The high pressure sensor Connect the high is connected to X32A pressure sensor of outdoor unit and turn ON PCB.
  • Page 265 Si20-701_B Troubleshooting by Remote Controller ∗2: “Pressure Sensor”, pressure / voltage characteristics table. PH = 1.38V-0.69 PH : Detected pressure (MPa) V : Output Voltage (V) -0.5 -0.5 Output voltage V...
  • Page 266 Troubleshooting by Remote Controller Si20-701_B 3.55 Suction Pipe Pressure Sensor Abnormality Remote Controller Display Applicable Models RZQ(S)-B, RZQ-C7, CMSQ Method of Error Detection The error is detected from pressure detected by low pressure sensor. Error Decision Conditions When the suction pipe pressure sensor is short circuit or open circuit.
  • Page 267 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution The low pressure sensor is Connect low connected to the pressure sensor outdoor unit properly and PCB.
  • Page 268 Troubleshooting by Remote Controller Si20-701_B 3.56 Outdoor Unit PCB Abnormality Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-C, RZR-KU/HU Method of Error Detection Detect error by current value during waveform output before compressor startup. Detect error by current sensor value during synchronized operation at the time of startup.
  • Page 269 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the power supply voltage between 180 Request an and 220 VAC? improvement to make the power supply voltage fall within the standard range.
  • Page 270 Troubleshooting by Remote Controller Si20-701_B 3.57 Outdoor Inverter PCB Abnormality Remote Controller Display Applicable Models RZQ-C7 Method of Error Detection Detect the error by current value during waveform output before compressor startup. Detect the error by current sensor value during synchronized operation at the time of startup.
  • Page 271 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Turn OFF the power supply once and then turn it ON again. Does it External factors return normally? (Noise, etc.) CHECK 16...
  • Page 272 Troubleshooting by Remote Controller Si20-701_B 3.58 Outdoor Unit PCB Abnormality Remote Controller Display Applicable Models RZQG Method of Error Detection Detect error by current value during waveform output before compressor startup. Detect error by current sensor value during synchronized operation at the time of startup. Detect error using an MP-PAM series capacitor overvoltage sensor.
  • Page 273 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the power supply Request an voltage between 180 improvement to and 220 VAC? make the power supply voltage fall within the standard range.
  • Page 274 Troubleshooting by Remote Controller Si20-701_B Turn the power ON again. Error is Replace the displayed again? outdoor unit PCB. External factor (Noise, etc.) Refer to P.459. CHECK 1...
  • Page 275 Si20-701_B Troubleshooting by Remote Controller 3.59 Overcurrent of DC Output (Instantaneous) Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Fin temperature is detected by the thermistor of the radiation fin. Error Decision Conditions When the temperature of the inverter radiation fin increases abnormally due to defective heat dissipation.
  • Page 276 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Could problem be caused by high Correct the radiation fin problem. temperature? (∗1) LEDs on outdoor unit PCB indicate radiation fin Inspect outdoor...
  • Page 277 Si20-701_B Troubleshooting by Remote Controller 3.60 Radiation Fin Temperature Rise Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG, RZR-KU/HU Method of Error Detection Radiation fin temperature is detected by the radiation fin thermistor. Error Decision Conditions When the temperature of the inverter radiation fin rises abnormally due to defective heat dissipation.
  • Page 278 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Can it be considered that the radiation fin Eliminate the temperature was cause. high? (∗1) Is the connector of the radiation fin...
  • Page 279 Si20-701_B Troubleshooting by Remote Controller Note: ∗1. Radiation fin temperature detection value Model Detection Reset 76°C 66°C RZQ100~140B8W1B RZR71KUV1 RZQ71B9V3B RZQS71·100B7V3B 87°C 77°C RZQ71C7V1B RZQS71·100C7V1B RZQG71LV1B 85°C 75°C RZR100~140KUV1 RZR100~140HUY1 RZR-KUV2S 88°C 78°C RZR-HUY2S RZQ100~140C7V1B RZQS125·140C7V1B RZQG100~140LV1B 89°C 79°C Is the error displayed again Replace the when the unit starts...
  • Page 280 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models CMSQ Method of Error Detection Fin temperature is detected by the thermistor of the radiation fin. Error Decision Conditions When the temperature of the inverter radiation fin increases above 93°C. Supposed Causes Actuation of fin thermal (Actuates above 93°C) Defective inverter PCB...
  • Page 281 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Radiation fin temperature of the Defective compressor inverter If the radiation fin from is high. radiation fin Power the switch box:...
  • Page 282 Troubleshooting by Remote Controller Si20-701_B X111A : EH CONNECTOR WHITE Refer to CHECK 3 on P.460.
  • Page 283 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ-C7 Method of Error Detection Radiation fin temperature is detected by the thermistor of the radiation fin. Supposed Causes Activation of fin thermal switch (93°C or more) Defective outdoor unit inverter PCB Defective radiation fin thermistor Troubleshooting Be sure to turn off the power switch before...
  • Page 284 Troubleshooting by Remote Controller Si20-701_B Supply power and start operation to check if the Replace the error occurs inverter PCB. again. Continue operation • There is a possibility of high temperature of the radiation fin caused by any field factors. Check the following items.
  • Page 285 Si20-701_B Troubleshooting by Remote Controller 3.61 Overcurrent of DC Output (Instantaneous) Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Current flowing in the power transistor is converted to voltage by T1C (DC current sensor) for detection. Error Decision Conditions When an excessive current flows in the power transistor.
  • Page 286 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. LEDs on outdoor unit PCB Inspect indoor indicate DC output unit PCB and overcurrent? remote controller. (∗1) the unit inoperable...
  • Page 287 Si20-701_B Troubleshooting by Remote Controller inverter output voltage Inspect same in all 3 (Note) Within ±5% compressor. phases? between phases U and V, between V and W and between W and U. Check Correct the main circuit parts. wiring. Defective main circuit parts.
  • Page 288 Troubleshooting by Remote Controller Si20-701_B 3.62 Momentary Overcurrent of Inverter Compressor Remote Controller Display Applicable Models RZQ-C7 Method of Error Detection The error is detected by converting the current flowing in the power transistor. Error Decision Conditions When an excessive current flows in the power transistor (32.3A).
  • Page 289 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. the stop valve Open the stop open? valve the lead wire of the compressor Replace the lead normal? wire of the compressor.
  • Page 290 Troubleshooting by Remote Controller Si20-701_B Restart the compressor, and Continues then check whether operation or not the error There may have recurs. been momentary power failure and others Power Replace the PCB (A3P). Restart the compressor, and Continue the then check whether or operation not the error recurs.
  • Page 291 Si20-701_B Troubleshooting by Remote Controller 3.63 Output Overcurrent Detection Remote Controller Display Applicable Models RZQG Method of Error Detection The error is detected by converting the current flowing to power transistor into voltage with CT1 (DC current sensor). Error Decision Conditions When overcurrent has run to power transistor.
  • Page 292 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the installation conditions. the stop valve Open the stop open? valve. compressor is Replace the grounded and short compressor.
  • Page 293 Si20-701_B Troubleshooting by Remote Controller instantaneous Correct the voltage drop power supply. generated? Compressor inspection. Inspect according to the diagnosis procedure for abnormal noise, vibration, operating status, etc. of the compressor.
  • Page 294 Troubleshooting by Remote Controller Si20-701_B 3.64 Inverter Compressor Abnormality Remote Controller Display Applicable Models CMSQ Method of Error Detection The error is detected from current flowing in the power transistor. Error Decision Conditions When an excessive current flows in the power transistor. (Instantaneous overcurrent also causes activation.) Supposed Causes Defective compressor coil (disconnected, defective...
  • Page 295 Si20-701_B Troubleshooting by Remote Controller Disconnect the cable from the compressor, and then check the compressor for the insulation resistance. insulation Power resistance is low (i.e., Replace the not more than compressor. 100kΩ.) Check the compressor motor coil for any broken wire.
  • Page 296 Troubleshooting by Remote Controller Si20-701_B Restart the Power compressor, and then check Normal whether or not the • Onsite causes error recurs. such as instantaneous power failure or open phase Power • Conduct Replace the inverter PCB. checks and diagnosis of compressor.
  • Page 297 Si20-701_B Troubleshooting by Remote Controller 3.65 Output Overcurrent Detection Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection The error is detected by converting the current flowing to power transistor into voltage with CT1 (DC current sensor). Error Decision Conditions When overcurrent has run to power transistor (Actuated even by instantaneous overcurrent)
  • Page 298 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check the installation conditions. Is the stop Open the stop valve open? valve. Is the compressor coil disconnected or Replace the...
  • Page 299 Si20-701_B Troubleshooting by Remote Controller Is the inverter output voltage generated approximately at the same increasing speed Replace the for each phase after outdoor unit turning ON PCB. again? (∗1) (U-V, V-W, W-U) Check the power supply voltage. instantaneous Correct the voltage drop power supply.
  • Page 300 Troubleshooting by Remote Controller Si20-701_B Note: ∗1. Approximate value When operating compressor with compressor output line disconnected, the compressor stops due to error after elapsed time of 5 seconds. Therefore, check the voltage increase for 5 seconds. Model Instantaneous overcurrent detection value RZQ71K, RZR71K RZQ71B9V3B RZQS71·100B7V3B...
  • Page 301 Si20-701_B Troubleshooting by Remote Controller 3.66 ( ) Electronic Thermal Switch (Time Lag) Remote Controller Display (L8) ∗ No display on remote controller. See “Error decision condition” below for more detail. Applicable Models RZ(Y) Method of Error Detection Current flowing in the power transistor is converted to voltage by T1C (DC current sensor) for detection.
  • Page 302 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. secondary current of inverter Compressor A (see list below) in overload. each phase? Inspect (∗1) compressor and refrigerant (Note) Measure current...
  • Page 303 Si20-701_B Troubleshooting by Remote Controller Note: ∗2. • Detecting values vary according to operating frequency. • Detecting value decrease 10% for each HPS activation.
  • Page 304 Troubleshooting by Remote Controller Si20-701_B 3.67 Inverter Current Abnormality Remote Controller Display Applicable Models CMSQ Method of Error Detection The error is detected by current flowing in the power transistor. Error Decision Conditions When overload in the compressor is detected. (Inverter secondary current 16.1A) Supposed Causes Compressor overload...
  • Page 305 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Output current check Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution current of not less than Power Overcurrent: 15A flows through the Check the compressor.
  • Page 306 Troubleshooting by Remote Controller Si20-701_B Check the power transistor on the inverter Power PCB using a multiple tester. Does the power Replace the transistor have any inverter PCB. abnormalities? ∗The inverter is likely to have got defective due to the error of the compressor.
  • Page 307 Si20-701_B Troubleshooting by Remote Controller 3.68 Inverter Compressor Overcurrent Remote Controller Display Applicable Models RZQ-C7 Method of Error Detection The error is detected by current flowing in the power transistor. Error Decision Conditions When overload in the compressor is detected For 460V units (1) 19.0A and over continues for 5 seconds.
  • Page 308 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Output current check Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution the stop valve Open the stop open? valve. Check if the Replace the compressor lead wires compressor lead are normal.
  • Page 309 Si20-701_B Troubleshooting by Remote Controller Error code “L8” is Continue the displayed again. operation. Check if the pressure difference between high pressure and low Defective pressure before pressure restarting is equalizing in the 0.2MPa or refrigerant circuit. below. Inspection of the compressor.
  • Page 310 Troubleshooting by Remote Controller Si20-701_B 3.69 Electronic Thermal (Time Lag) Remote Controller Display Applicable Models RZQG Method of Error Detection The error is detected from the current flowing to power transistor into voltage with CT1 (DC current sensor). Error Decision Conditions When compressor overload (except for when startup) is detected Supposed Causes...
  • Page 311 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the secondary current of the inverter higher than A (*1) for each phase? Is the stop valve Open the stop valve.
  • Page 312 Troubleshooting by Remote Controller Si20-701_B Note: ∗1 Secondary electronic thermal detection value Model Detection value Cooling 12.6 or 12.2A × 260 seconds RZQG71 Heating 14.8A × 260 seconds Cooling 16.1A × 260 seconds RZQG100-140 Heating 22.1A × 260 seconds Refer to P.464. CHECK 4 Refer to P.468.
  • Page 313 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection The error is detected from the current flowing to power transistor into voltage with CT1 (DC current sensor). Inverter PCB detects the disorder of position signal. Error Decision Conditions When compressor overload (except for when startup) is detected.
  • Page 314 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the secondary current of the Compressor inverter higher than overload. A (∗1) for each Inspection of the phase? compressor and...
  • Page 315 Si20-701_B Troubleshooting by Remote Controller CHECK 4 Continuity check Replace the in the power transistor outdoor unit (IGBT). Is the PCB. continuity normal? Is the inverter output voltage generated approximately at the same increasing speed Replace the on each phase after outdoor unit turning ON PCB.
  • Page 316 Troubleshooting by Remote Controller Si20-701_B 3.70 Stall Prevention (Time Lag) Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Current flowing in the power transistor is converted to voltage by T1C (DC current sensor) for detection. Error Decision Conditions When overload in the compressor is detected during startup Supposed Causes...
  • Page 317 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the difference between high and Defective low pressure levels pressure less than 0.2 equalization. MPa? Inspect refrigerant...
  • Page 318 Troubleshooting by Remote Controller Si20-701_B 3.71 Inverter Startup Error Remote Controller Display Applicable Models CMSQ, RZQ-C7 Method of Error Detection This error code will be output if overcurrent occurs at the time of startup. Error Decision Conditions When the startup control is failed When an overcurrent is passed to the inverter due to the error of a compressor or electrical system Supposed Causes...
  • Page 319 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the stop Open the stop valve open? valve. Are wire connections properly made Rectify the wire (according to the connections.
  • Page 320 Troubleshooting by Remote Controller Si20-701_B Is a difference between high pressure and low Defective pressure prior to pressure startup equalization: 0.2MPa? Check the refrigerant system. error End of It can take a measures: Power maximum of Check the 60 minutes to refrigerant determine the system.
  • Page 321 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG, RZR-KU/HU Method of Error Detection The error is detected from the current flowing to power transistor into voltage with CT1 (DC current sensor). Inverter PCB detects the disorder of position signal. Error Decision Conditions When compressor overload and change of load on is detected...
  • Page 322 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check the installation conditions. Is the stop Open the stop valve open? valve. Is the difference between high and low pressure before...
  • Page 323 Si20-701_B Troubleshooting by Remote Controller RZQ-K, RZQ(S)-B/C RZQ-H, RZQG compressor is Replace the grounded and short- compressor. circuited. Compressor inspection. Inspect according to the diagnosis procedure for abnormal noises, vibration, operating status, etc. of the compressor. Is the inverter output voltage generated approximately at the Replace the...
  • Page 324 Troubleshooting by Remote Controller Si20-701_B 3.72 Transmission Error Between Inverter and Control Remote Controller Display Applicable Models CMSQ, RZQ-C7 Method of Error Detection Check the communication state between inverter PCB and control PCB by micro-computer. Error Decision Conditions When the correct communication is not conducted in certain period.
  • Page 325 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. the fan transmission wire Connect the connectors wrongly connectors to the connected? corresponding color (black or yellow).
  • Page 326 Troubleshooting by Remote Controller Si20-701_B Disconnect the cable from the fan, and then check the fan motor for the insulation resistance. insulation Replace the fan resistance is low (i.e., not motor. more than Replace the fan 1MΩ.) driver PCB. Power Check for connector connections: Remove and insert the connectors shown below.
  • Page 327 Si20-701_B Troubleshooting by Remote Controller Is the micro controller normal monitor (green) This is not LC. of the PCB Recheck for the blinking? error code. Check 10 or more seconds after the power supply is turned ON. fan driver Replace the PCB do not blink.
  • Page 328 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQG Method of Error Detection Check whether transmission between control and inverter PCB is carried out normally. Error Decision Conditions When the transmission is not carried out in a specified period of time or longer Supposed Causes Defective outdoor unit fan motor...
  • Page 329 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution the fan motor connector Connect the connected? connector. Disconnect the fan motor connector, and turn ON again.
  • Page 330 Troubleshooting by Remote Controller Si20-701_B 3.73 Transmission Error (between Control PCB and Inverter PCB) Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection Check whether transmission between control PCB and inverter PCB is carried out normally. Error Decision Conditions When the transmission is not carried out in a specified period of time or longer Supposed Causes...
  • Page 331 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the fan motor connector Connect the connected? connector, and turn ON again. connectors connecting the control PCB and Connect the inverter PCB...
  • Page 332 Troubleshooting by Remote Controller Si20-701_B Is the micro- computer normal Replace the monitor (green) on outdoor unit inverter PCB PCB. blinking? RZQ-K RZQ-H, RZQ(S)-B/C, RZR Is the micro- computer normal Replace the LED on control PCB outdoor unit blinking? PCB. Check for defective connector...
  • Page 333 Si20-701_B Troubleshooting by Remote Controller 3.74 Inverter Over-Ripple Protection Remote Controller Display Applicable Models CMSQ, RZQ-C7 Method of Error Detection Imbalance in supply voltage is detected in PCB. Imbalance in the power supply voltage causes increased ripple of voltage of the main circuit capacitor in the inverter.
  • Page 334 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Imbalance in supplied voltage is in excess of 14 V. (∗1) Open phase Open phase? Normalize the field cause.
  • Page 335 Be sure to explain to the user Give the user a copy of "notification of that there is a "power supply inspection results" and leave it up to imbalance" for which DAIKIN him to improve the imbalance. is not responsible.
  • Page 336 Troubleshooting by Remote Controller Si20-701_B 3.75 Open Phase or Power Supply Voltage Imbalance Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG, RZR-KU/HU Method of Error Detection The error is detected according to the voltage waveform of main circuit capacitor built in inverter. Error Decision Conditions When the aforementioned voltage waveform becomes identical with the waveform of the power supply open...
  • Page 337 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Check LED on the outdoor unit PCB External factor. (Open phase?) Open phase of power supply Field factors.
  • Page 338 Troubleshooting by Remote Controller Si20-701_B 3.76 Radiation Fin Thermistor Abnormality Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Open circuit or short circuit in radiation fin thermistor is detected when the compressor is not operating. Error Decision Conditions When open circuit or short circuit in radiation fin thermistor is detected in non-operating compressor Supposed Causes...
  • Page 339 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check LED indication on outdoor unit PCB. radiation fin External factor. thermistor defective? Disconnect connector from the outdoor unit PCB, and check resistance of temperature...
  • Page 340 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models CMSQ Method of Error Detection Resistance of radiation fin thermistor is detected when the compressor is not operating. Error Decision Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited status.
  • Page 341 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Disconnect the cable from the compressor, and then Power check the compressor for the insulation resistance. insulation resistance is low (i.e., Replace the...
  • Page 342 Troubleshooting by Remote Controller Si20-701_B 3.77 Radiation Fin Thermistor or Related Abnormality Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection Detection by open or short circuit of the radiation fin thermistor during the compressor stops operating. Error Decision Conditions When open or short circuit of the radiation fin thermistor is detected during the compressor stops operating...
  • Page 343 Si20-701_B Troubleshooting by Remote Controller 3.78 Defective Capacity Setting Remote Controller Display Applicable Model R(Y)-LU, RR-M Method of Error Detection Check whether set value (i.e., factory setting value) written in E PROM or set value with the (replaced) capacity setting adaptor (X26A) is the same as that of outdoor unit capacity.
  • Page 344 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution capacity setting Connect an adaptor connected to the outdoor unit adaptor suitable PCB? (∗1) for the applicable model.
  • Page 345 Si20-701_B Troubleshooting by Remote Controller 3.79 Error in Capacity Setting Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Checks if the value set in the capacity setting adaptor is the same as the capacity set in the outdoor unit PCB. Error Decision Conditions Error is generated when installed with the capacity setting adaptor incompatible with the PCB.
  • Page 346 Troubleshooting by Remote Controller Si20-701_B 3.80 Field Setting Error after Replacing Main PCB or Defective Combination of PCB Remote Controller Display Applicable Models CMSQ Method of Error Detection The defective (or no) field setting after replacing PCB or defective PCB combination is detected through communications with the inverter.
  • Page 347 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Has the PCB been replaced? When replacing the main PCB, were field Correct the field setting properly settings.
  • Page 348 Troubleshooting by Remote Controller Si20-701_B 3.81 Defective Combination of Inverter and Fan Driver Remote Controller Display Applicable Models RZQ-C7 Method of Error Detection To be detected based on the data transmission with INV. Error Decision Conditions Judge if the inverter PCB type is correct based on the data transmission.
  • Page 349 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution the type of the Replace with the compressor inverter correct PCB correct? compressor inverter PCB. Is the type of the fan Replace with the...
  • Page 350 Troubleshooting by Remote Controller Si20-701_B 3.82 Defective Capacity Setting Remote Controller Display Applicable Models RZQG Method of Error Detection Check whether set value written in E PROM (at factory) or set value of capacity setting adaptor (for spare) is the same as outdoor unit capacity.
  • Page 351 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Has the PCB been replaced? Is the type Replace with a of PCB correct? correct PCB. Is the correct capacity setting...
  • Page 352 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection Check whether set value written in E PROM (at factory) or set value of capacity setting adaptor (for replacement) is the same as outdoor unit capacity. Error Decision Conditions When the set value on E PROM differs from the outdoor...
  • Page 353 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the capacity setting adaptor connected to Connect the outdoor unit adaptor for the PCB? (∗1) applicable model.
  • Page 354 Troubleshooting by Remote Controller Si20-701_B 3.83 Refrigerant Shortage Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU/LU, RR-M Method of Error Detection Lack of gas is detected according to discharge pipe temperature. Error Decision Conditions Micro-computer decides whether there is a refrigerant shortage and detects error.
  • Page 355 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Refrigerant shortage is detected based on the discharge pipe temperature. Error Decision Conditions Micro-computer judges and detects whether refrigerant shortage occurs or not. ∗ The system does not decide to error and repeats retry. Press the check button to indication "U0"...

  • Page 356: Shortage Or Electronic Expansion Valve Failure

    Troubleshooting by Remote Controller Si20-701_B 3.84 Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure Remote Controller Display Applicable Models CMSQ Method of Error Detection Refrigerant shortage is detected by discharge pipe thermistor. Error Decision Conditions Micro-computer judge and detect if the system is short of refrigerant.

  • Page 357: Remote Controller

    Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Cooling pressure is 0.1 Refrigerant MPa or less. shortage, closing of stop valve or refrigerant system is clogged.

  • Page 358: Check

    Troubleshooting by Remote Controller Si20-701_B Resistance is normal when measured with the suction pipe thermistor (R7T) and coil Replace the thermistor (R4T) thermistor. disconnected from the outdoor unit PCB. CHECK 3 Replace the outdoor unit PCB (A1P). Refer to P.460. CHECK 3...
  • Page 359 Si20-701_B Troubleshooting by Remote Controller 3.85 Refrigerant Shortage Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B Method of Error Detection (In normal operation) Refrigerant shortage is detected according to the electronic expansion valve opening degree and measured temperatures and pressures. Error Decision Conditions (In cooling operation) When the electronic expansion valve opens fully and low pressure is below 0.1 MPa (For RZQ-C, RZQG:...
  • Page 360 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the stop Open the stop valve open? valve. Is the refrigerant Collect amount appropriate? refrigerant.
  • Page 361 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ(S)-C Method of Error Detection (In cooling operation) Detection based on difference in temperature between temperature preset by remote controller and indoor suction air temperature, electronic expansion valve opening degree, compressor frequency and low pressure.
  • Page 362 Troubleshooting by Remote Controller Si20-701_B Supposed Causes Refrigerant shortage Clogged refrigerant piping system Mismatching of wiring and piping Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution CHECK 12 Check for refrigerant shortage.
  • Page 363 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZR71KUV1, RZQG Method of Error Detection (In cooling operation) Detection based on difference in temperature between temperature preset by remote controller and suction air temperature, electronic expansion valve opening degree, compressor frequency and low pressure.
  • Page 364 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution CHECK 12 Check for inadequate refrigerant. Is the Collect refrigerant level refrigerant and proper? recharge a proper amount of refrigerant after Check the transmission...
  • Page 365 Si20-701_B Troubleshooting by Remote Controller 3.86 Reverse Phase Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU (3-phase equipment only) Method of Error Detection Reverse phase detection circuit detects the phase of each phase and determines whether it is normal phase, reverse phase or lack of phase. Supposed Causes Defective power supply wiring connection Power supply wiring is broken or disconnected.
  • Page 366 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Model R(Y)-LU, RR-M, RZQ-C7 Method of Error Detection The reverse phase detection circuit detects the phase of each phase and judge whether it is normal or reverse. Possible Causes Defective connection of power supply wiring Disconnection in power supply wiring Troubleshooting Be sure to turn off the power switch before...
  • Page 367 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models CMSQ Method of Error Detection The phase of each phase are detected by reverse phase detection circuit and right phase or reverse phase are judged. Error Decision Conditions When a significant phase difference is made between phases Supposed Causes Power supply reverse phase...
  • Page 368 Troubleshooting by Remote Controller Si20-701_B 3.87 Insufficient Voltage Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Detection is based on the voltage in main circuit capacitor for inverter and the supply voltage. Error Decision Conditions When the voltage in main circuit capacitor for inverter and the supply voltage drop (171 - 190 VAC), or when power outage of more than 20 or 30 ms occurs.
  • Page 369 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check LED indication External factor on outdoor unit PCB. (Is voltage too low?) supply voltage 220-240V (RZ(Y)71LV1), 220V Local power (RZY71 LVAL,...
  • Page 370 Troubleshooting by Remote Controller Si20-701_B 3.88 Power Supply Voltage Abnormality Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection The error is detected according to the voltage of main circuit capacitor built in the inverter and power supply voltage.
  • Page 371 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check LED on outdoor unit PCB. External factor (Is the voltage insufficient?) Is the power supply voltage between Field factors 200±10% VAC?
  • Page 372 Troubleshooting by Remote Controller Si20-701_B 3.89 Power Supply Insufficient or Instantaneous Failure Remote Controller Display Applicable Models RZQ-C7, CMSQ Method of Error Detection Detection of voltage of main circuit capacitor built in the inverter and power supply voltage. Error Decision Conditions When the voltage aforementioned is not less than 780V or not more than 320V, or when the current-limiting voltage does not reach 200V or more or exceeds 740V.
  • Page 373 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check for power supply voltage. Voltage On-site causes. between phases: 380 to Make proper 415V Phase wire connections voltage: 220 without open...
  • Page 374 Troubleshooting by Remote Controller Si20-701_B insulation resistance is low (i.e., Replace the fan not more than motor. 1MΩ.) Replace the fan driver. Check the inverter power transistor. Has the power transistor Replace the got defective? inverter PCB. Power ∗Observe the conditions of the PCB.
  • Page 375 Si20-701_B Troubleshooting by Remote Controller Has the power transistor Replace the fan got defective? driver PCB. ∗Observe the conditions of the PCB. Check for connector connections: Remove and insert the connectors shown below. Furthermore, check the connectors for terminal conditions and continuity. •...
  • Page 376 Troubleshooting by Remote Controller Si20-701_B Turn ON the power supply. Stop (standby) Recheck for the before the fan power supply. If rotates. there is no problem with the power supply, replace the noise filter PCB. If the error recurs, replace the inverter PCB.
  • Page 377 Si20-701_B Troubleshooting by Remote Controller 3.90 Power Supply Voltage Abnormality Remote Controller Display Applicable Models RZQG Method of Error Detection The error is detected according to the voltage of main circuit capacitor built in the inverter and power supply voltage. Error Decision Conditions When the voltage of main circuit capacitor built in the inverter and power supply voltage drop or when the...
  • Page 378 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the power supply voltage Field factors between 200 ±10% VAC? Remove the connector for fan motor on the PCB, and operate.
  • Page 379 Si20-701_B Troubleshooting by Remote Controller When the compressor is running, measure the voltage between + and - of electrolytic capacitor (C+, C-). Is the measured voltage Monitor the 220 VDC or voltage more? (Instantaneous voltage drop) Replace the outdoor unit PCB.
  • Page 380 Troubleshooting by Remote Controller Si20-701_B 3.91 Check Operation is not Executed Remote Controller Display Applicable Models CMSQ Method of Error Detection Check operation is executed or not executed Error Decision Conditions The error is decided when the unit starts operation without check operation.
  • Page 381 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution the check operation Press and hold performed on BS4 on the outdoor unit outdoor unit main PCB? PCB for 5 seconds or more,...
  • Page 382 Troubleshooting by Remote Controller Si20-701_B 3.92 Transmission Error (Between Indoor Unit and Outdoor Unit) Remote Controller Display Applicable Models R(Y)-FU Method of Error Detection Micro-computer checks if transmission between indoor and outdoor units is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Wiring indoor-outdoor transmission wire is incorrect.
  • Page 383 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Diagnosis of incorrect or broken/disconnected wiring If the LEDs on the indoor unit PCB are OFF, it indicates that the transmission wiring between indoor and outdoor units may be incorrect or broken/disconnected. Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
  • Page 384 Troubleshooting by Remote Controller Si20-701_B Check of outdoor NO (ON or OFF) unit micro-computer normal H1P. Is H1P blinking? Turn OFF the power supply and turn the power Is H1P blinking? Resets normally. External factor (Noise, etc.). Is H1P ON? Replace the indoor unit PCB.
  • Page 385 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU/LU/NU/PU, RR-M Method of Error Detection Micro-computer checks if transmission between indoor and outdoor units is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Wiring indoor-outdoor transmission wire is incorrect.
  • Page 386 Troubleshooting by Remote Controller Si20-701_B Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check of indoor unit NO (ON or OFF) micro-computer normal HAP. Is HAP blinking? Turn OFF the power supply and turn the power ON.
  • Page 387 Si20-701_B Troubleshooting by Remote Controller Check of outdoor unit NO (ON or OFF) micro-computer normal HAP. Is HAP blinking? Turn OFF the power supply and turn the power Is HAP blinking? External factor (Noise, etc.). Is HAP ON? Failure of outdoor unit PCB.
  • Page 388 Troubleshooting by Remote Controller Si20-701_B 3.93 Transmission Error Between Indoor Unit and Outdoor Unit Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Micro-computer checks if transmission between indoor and outdoor units is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Wiring indoor-outdoor transmission wire is incorrect.
  • Page 389 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Diagnosis of incorrect or broken/disconnected wiring If the LEDs on the indoor unit PCB are OFF, it indicates that the transmission wiring between indoor and outdoor units may be incorrect or broken/disconnected. Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
  • Page 390 Troubleshooting by Remote Controller Si20-701_B NO (ON or OFF) Is H1P blinking? Turn OFF the power supply and turn the power ON. Is H1P blinking? Resets normally. External factor (Noise, etc.). Is H1P ON? Replace the indoor unit PCB. NO (OFF) Turn OFF the power supply, disconnect the No.2 indoor-outdoor...
  • Page 391 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ-K/H, RZR-KU/HU Error Decision Conditions The error is generated when the micro-processor detects that the transmission between the indoor unit and the outdoor unit is not normal over a certain amount of time. Supposed Causes Wiring indoor-outdoor transmission wire is incorrect Defective indoor unit PCB...
  • Page 392 Troubleshooting by Remote Controller Si20-701_B Is any optional accessory (∗1) connected? the power for the optional Wire correctly. accessory supplied from the correct terminal? Is HAP on the outdoor unit PCB blinking? (Outdoor unit PCB) Turn OFF the power supply and disconnect the connector of the outdoor unit fan motor.
  • Page 393 Si20-701_B Troubleshooting by Remote Controller Is HAP blinking? (Outdoor Replace the unit PCB) outdoor unit fan motor. Check the resistance value of the outdoor unit fan motor. Is the resistance value of the outdoor unit fan Replace the motor normal? outdoor unit fan motor.
  • Page 394 Troubleshooting by Remote Controller Si20-701_B The error is Replace the displayed again. outdoor unit inverter PCB. After turning OFF the power supply, correctly insert the connector of the fan motor and then restore the power. Does error Replace the "U4" or "UF" reoccur? indoor unit PCB.
  • Page 395 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models FMCQ, FMDQ-A7/B7 CMSQ Method of Error Detection Micro-computer checks if transmission between indoor and outdoor units is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Indoor to outdoor, outdoor to outdoor transmission...
  • Page 396 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution the indoor or outdoor unit PCB been replaced, or has the Press and hold indoor - outdoor or the RESET outdoor - outdoor button on the...
  • Page 397 Si20-701_B Troubleshooting by Remote Controller Operation ready lamp (H2P) is blinking. Lamp does not go OFF for Press and hold 12 minutes or the RESET more. button on the outdoor unit PCB for 5 seconds. indoor - outdoor and outdoor - outdoor unit Fix the transmission wiring indoor/outdoor or...
  • Page 398 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ(S)-B/C Error Decision Conditions The error is generated when the micro-processor detects that the transmission between the indoor and the outdoor unit is not normal over a certain amount of time. Supposed Causes Wiring indoor-outdoor transmission wire is incorrect Defective indoor unit PCB...
  • Page 399 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Diagnosis of incorrect or broken/disconnected wiring. If the LEDs on the indoor unit PCB are OFF, it indicates that the transmission wiring between indoor and outdoor units may be incorrect or broken/disconnected. Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
  • Page 400 Troubleshooting by Remote Controller Si20-701_B Is any optional accessory (∗1) connected? the power for the optional accessory supplied Wire correctly. from between 1 and 2 on terminal block X2M? Is HAP on the outdoor unit PCB blinking? (Outdoor unit PCB) Turn OFF the power supply and disconnect the connector of the outdoor...
  • Page 401 Si20-701_B Troubleshooting by Remote Controller Does the fuse (∗2) have Replace the fuse. continuity? CHECK 13 Check the fan output voltage. Is the output voltage RZQ71B9, normal? RZQS71·100B 7 (1φ), RZQ100~140B 8 (3φ): After turning OFF the Replace the power supply, correctly inverter PCB insert the connector of (A2P).
  • Page 402 Troubleshooting by Remote Controller Si20-701_B Does "U4" RZQ71B9, error reoccur? RZQS71·100B 7 (1φ), RZQ100~140B 8 (3φ): Replace the outdoor PCB (A1P). RZQ100~140C7, RZQS125·140 C7 (1φ): Replace the outdoor unit PCB (A1P). After turning OFF the power supply, correctly insert the connector of the fan motor and then restore the power.
  • Page 403 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ-C7 Method of Error Detection Micro-computer checks if transmission between indoor and outdoor units is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Wiring indoor-outdoor transmission wire is incorrect.
  • Page 404 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Diagnosis of incorrect or broken/disconnected wiring If the LEDs on the indoor unit PCB are OFF, it indicates that the transmission wiring between indoor and outdoor units may be incorrect or broken/ disconnected. Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged.
  • Page 405 Si20-701_B Troubleshooting by Remote Controller Is HAP NO (Lamp is ON or OFF) blinking? (Outdoor unit PCB) Turn OFF the power supply and then turn it Is HAP blinking? The outdoor unit (Outdoor unit PCB is normal. PCB) Check for external factors (noise, etc.).
  • Page 406 Troubleshooting by Remote Controller Si20-701_B "U4" is displayed Replace the continuously. indoor unit PCB. It is normal. Check for external factors (noise, etc.).
  • Page 407 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQG Method of Error Detection The error is generated when the micro-processor detects that the transmission between the indoor and the outdoor unit is not normal over a certain amount of time. Error Decision Conditions When the transmission is not carried out normally over a certain amount of time...
  • Page 408 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the power supply Field factor voltage between 180 and 220 VAC? Continue the condition that the blinking interval of HAP on Connect the...
  • Page 409 Si20-701_B Troubleshooting by Remote Controller Is any optional accessory (∗2) connected? the power for the optional accessory supplied Wire correctly. from between 1 and 2 on terminal block X2M? Is HAP on the outdoor unit PCB blinking? Turn OFF the power supply and disconnect the connector of the outdoor unit fan motor.
  • Page 410 Troubleshooting by Remote Controller Si20-701_B Check the resistance value of the outdoor unit fan motor. the resistance value of the outdoor Replace the unit fan motor outdoor unit fan normal? motor. Does the Make the fuse fuse (F6U) have normal. continuity? •...
  • Page 411 Si20-701_B Troubleshooting by Remote Controller 3.94 Transmission Error Between Indoor Unit and Remote Controller Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/FU/KU/LU/NU/PU, RR-M Method of Error Detection Micro-computer checks if transmission between indoor unit and remote controller is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes...
  • Page 412 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Control by 2 remote controllers SS1 of both remote Set one of the controllers is set to remote "Main."...
  • Page 413 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZ(Y) Method of Error Detection Micro-computer checks if transmission between indoor unit and remote controller is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Defective remote controller Defective indoor unit PCB...
  • Page 414 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Control by 2 remote controllers SS1 of both remote Set one of the controllers is set to remote "Main."...
  • Page 415 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Method of Error Detection Micro-computer checks if transmission between indoor unit and remote controller is normal. Error Decision Conditions The error is generated when the micro-processor detects that the transmission between the indoor unit and the remote controller is not normal over a certain amount of time.
  • Page 416 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Control by 2 remote controllers SS1 of both remote Set one of the controllers is set to remote MAIN.
  • Page 417 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models RZQ-C7, RZQG, CMSQ Method of Error Detection The error is generated when the micro-computer detects that the transmission between the indoor and the outdoor unit is not normal over a certain amount of time. Error Decision Conditions Normal transmission does not continue for specified period.
  • Page 418 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Using 2- remote controllers control. SS1 of both remote Set one remote controllers is set to controller to "MAIN."...
  • Page 419 Si20-701_B Troubleshooting by Remote Controller 3.95 Transmission Error Between Outdoor Units Remote Controller Display Applicable Models CMSQ Method of Error Detection Micro-computer checks if transmission between outdoor units. Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Improper connection of transmission wiring between...
  • Page 420 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. there any broken wire or erroneous wire connection in the Fix the outdoor communication wiring units multi of multi outdoor connection...
  • Page 421 Si20-701_B Troubleshooting by Remote Controller External control adaptor for outdoor unit •Is this PCB energized? •Does the cool/heat unified address match? Outdoor unit (unified master unit) •Is this energized? •Does the cool/heat unified address match? Does an error occur when Replace the the cool / heat selector external control...
  • Page 422 Troubleshooting by Remote Controller Si20-701_B 3.96 Transmission Error Between Main Remote Controller and Sub Remote Controller Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU/LU, CMSQ Method of Error Detection In case of controlling with 2- remote controller, check the system using micro-computer if signal transmission between indoor unit and remote controller (main and sub) is normal.
  • Page 423 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Controlling with 2-remote controller SS-1 switch on remote controller PCB Turn the SS-1 is turned to switch of one "Main"...
  • Page 424 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZ(Y) Method of Error Detection In case of controlling with 2- remote controller, check the system using micro-computer if signal transmission between indoor unit and remote controller (main and sub) is normal.
  • Page 425 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Controlling with 2-remote controller SS-1 switch on remote controller PCB Turn the SS-1 is turned to switch of one "Main"...
  • Page 426 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG, RZR-KU/HU Method of Error Detection In case of controlling with 2- remote controller, check the system using micro-computer if signal transmission between indoor unit and remote controller (main and sub) is normal.
  • Page 427 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Controlling with 2-remote controller SS-1 switch on remote controller PCB Turn the SS-1 is turned to switch of one MAIN.
  • Page 428 Troubleshooting by Remote Controller Si20-701_B 3.97 Transmission Error Between Indoor and Outdoor Units in the Same System Remote Controller Display Applicable Models RZQ-C7, CMSQ Method of Error Detection Detect the error signal of any other indoor unit within the system concerned. Error Decision Conditions When the error decision is made on any other indoor unit within the system concerned...
  • Page 429 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Have 2 minutes and over passed since Make judgement the " "code was again based on indicated? the indication after 2 minutes...
  • Page 430 Troubleshooting by Remote Controller Si20-701_B " " code blinks in the remote controller of Go on to the " " the other unit in the troubleshooting same refrigerant circuit. Go on to the " " troubleshooting...
  • Page 431 Si20-701_B Troubleshooting by Remote Controller 3.98 Defective Field Setting Switch Remote Controller Display Applicable Models RY-F, R(Y)-G/GA/KU/LU Supposed Causes Defective indoor unit or outdoor unit PCB Defective power supply PCB Indoor-outdoor, indoor-indoor unit transmission wiring Defective remote controller wiring...
  • Page 432 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the remote controller Connect the connected to more remote controller than 1 indoor correctly. unit? Is the outdoor unit...
  • Page 433 Si20-701_B Troubleshooting by Remote Controller Are the transmission normal monitors (HBP) of all indoor unit PCB blinking? Turn the power OFF once, then restart, and restart operation. Operating normally? Is the indoor-indoor and indoor-outdoor Connect jumper correctly correctly. connected? Replace the indoor unit PCB.

  • Page 434: Indoor And Outdoor Units

    Troubleshooting by Remote Controller Si20-701_B 3.99 Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Remote Controller Display Applicable Models FMCQ, FMDQ-A7/B7 CMSQ Method of Error Detection A difference occurs in data by the type of refrigerant between indoor and outdoor units.
  • Page 435 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Reset all power supplies for indoor and outdoor units connected to one and the same system. Is the error code "UA"...
  • Page 436 Troubleshooting by Remote Controller Si20-701_B Does the refrigerant type of indoor and Matches the outdoor unit refrigerant type match? of indoor and outdoor unit. Is it a multi outdoor unit Replace the connection outdoor unit main system? PCB. Is the combination of master unit and slave Change to a...
  • Page 437 Si20-701_B Troubleshooting by Remote Controller 3.100 Field Setting Switch Abnormality Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU Error Decision Conditions The error is generated when incorrect field settings have been set for pair / twin / triple / double twin. Supposed Causes Defective indoor unit or outdoor unit PCB Defective power supply PCB...
  • Page 438 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the remote controller Connect the connected to more remote controller than 1 indoor correctly. unit? Is the setting of...
  • Page 439 Si20-701_B Troubleshooting by Remote Controller Turn OFF the power and then the power ON, and restart operation. Operating normally? Is the indoor-indoor and indoor-outdoor Connect jumper correctly correctly. connected? Replace the indoor unit PCB. Operates normally.
  • Page 440 Troubleshooting by Remote Controller Si20-701_B 3.101 Field Setting Switch and Transmission Line Abnormality Remote Controller Display Applicable Models RZQ-C7, RZQG Error Decision Conditions Incorrect field setting For RZQ-C7 The number of indoor units connected to this system is more than limited. For RZQG Incorrect combination indoor unit and outdoor unit Supposed Causes...
  • Page 441 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution RZQG RZQ-C series or RZQZ series? RZQ-C Is the outdoor unit simultaneous ON/OFF Check the multi of the indoor setting for unit?
  • Page 442 Troubleshooting by Remote Controller Si20-701_B Do the micro-computer normal monitors (HAP) on all indoor unit PCB's blink? the wires between indoor- indoor and indoor- Connect outdoor correctly correctly. connected? power supply for the option device connected from the terminal block (X2M) Connect between 1 and 2 correctly.
  • Page 443 Si20-701_B Troubleshooting by Remote Controller Does the system conduct normal operation? the wires between indoor- indoor and indoor- Connect outdoor correctly correctly. connected? Replace the indoor unit PCB. Normal...
  • Page 444 Troubleshooting by Remote Controller Si20-701_B 3.102 Centralized Address Setting Error Remote Controller Display Applicable Models RZQ-K/H, RZQ(S)-B/C, RZQG, RZR-KU/HU Method of Error Detection Indoor unit micro-computer detects and judges the centralized address signal according to the transmission between indoor units. Error Decision Conditions When the micro-computer judges that the centralized address signal is duplicated...

  • Page 445: Centralized Controller

    Si20-701_B Troubleshooting by Remote Controller 3.103 Address Duplication of Centralized Controller Remote Controller Display Applicable Models CMSQ Method of Error Detection The principal indoor unit detects the same address as that of its own on any other indoor unit. Error Decision Conditions The error decision is made as soon as the abnormality aforementioned is detected.
  • Page 446 Troubleshooting by Remote Controller Si20-701_B 3.104 Transmission Error between Centralized Controller and Indoor Unit Remote Controller Display Applicable Models FMCQ, FMDQ-A7/B7 Centralized controller Schedule timer intelligent Touch Controller Method of Error Detection Micro-computer checks if transmission between indoor unit and centralized controller is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time...
  • Page 447 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the indoor unit for which “UE” is displayed. Is Continued to (C) the transmission error (on the following “UE”...
  • Page 448 Troubleshooting by Remote Controller Si20-701_B the setting of centralized control Make correct group No. be setting of the made? centralized control group No. centralized control Check whether group No. for indoor or not there are unit changed? no problems with the transmission wiring length, types of cables...
  • Page 449 Si20-701_B Troubleshooting by Remote Controller Check transmission wiring between Abnormal Correct the centralized controller wiring. for any broken wire. CHECK 17 Normal Check transmission wiring with the Abnormal master unit centralized Correct the controller for any wiring. broken wire. CHECK 17 Normal the master unit central setting...
  • Page 450 Troubleshooting by Remote Controller Si20-701_B Disconnect the transmission wiring of the master unit centralized controller, and then check the voltage between the transmission terminals (F1 and F2) of the master unit transmission equipment using a multiple meter. Is the voltage between the terminals F1 (+) and Replace the...
  • Page 451 Si20-701_B Troubleshooting by Remote Controller Remote Controller Display Applicable Models Centralized remote controller Schedule timer All models of indoor units of RZQG and RZQ-C series Method of Error Detection Micro-computer checks if transmission between indoor unit and centralized controller is normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time...
  • Page 452 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution transmission wiring disconnected Fix the wiring or wired correctly. incorrectly? RZQG RZQ-C Is the power supply turned ON for indoor Turn indoor unit's units displaying...
  • Page 453 Si20-701_B Troubleshooting by Remote Controller Is the centralized controller's connector for setting Connect the centralized controller connector disconnected? correctly. Replace the centralized controller.
  • Page 454 Troubleshooting by Remote Controller Si20-701_B 3.105 Mis-connection of Field Wiring Remote Controller Display Applicable Models Cooling Only model R-FU Method of Error Detection Judgement by circuit of the PCB to detect wrong wiring. Supposed Causes Power supply wiring is broken or disconnected. Mis-connection of field wiring Troubleshooting Be sure to turn off the power switch before...
  • Page 455 Si20-701_B Troubleshooting by Remote Controller 3.106 System is not Set yet Remote Controller Display Applicable Models FMCQ, FMDQ-A7/B7 CMSQ Method of Error Detection On check operation, the number of indoor units in terms of transmission is not corresponding to that of indoor units that have made changes in temperature.
  • Page 456 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Are the stop valves Open stop valve. opened? Is the check operation carried out? indoor- outdoor and outdoor-outdoor unit Replace the...
  • Page 457 Si20-701_B Troubleshooting by Remote Controller 3.107 Transmission Error between Indoor and Outdoor Unit / Piping and Wiring Mismatch / Refrigerant Shortage Remote Controller Display Applicable Models RZQ-K/H, RZR-KU/HU, RZQG Method of Error Detection Check the transmission between the indoor and outdoor units with a micro-computer when the power turned ON.

  • Page 458: Outdoor Units

    Troubleshooting by Remote Controller Si20-701_B Supposed Causes Defective transmission wiring between the indoor and outdoor units Mismatching of wiring and piping Refrigerant shortage Clogged refrigerant piping system Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged.
  • Page 459 Si20-701_B Troubleshooting by Remote Controller CHECK 12 Recharge a Is the refrigerant level proper amount of proper? refrigerant after refrigerant recovery and vacuum drying. CHECK 11 Check the refrigerant piping system for clogging. Note: ∗1 ON for 0.2 second and OFF for 0.2 second (Blink about 25 times for 10 seconds) (Normally, ON for 0.4 second and OFF for 0.4 second (Blink about 12 times for 10 seconds))
  • Page 460 Troubleshooting by Remote Controller Si20-701_B Remote Controller Display Applicable Models RZQ(S)-B/C Method of Error Detection Check the transmission between the indoor and outdoor units with a micro-computer when the power turned ON. Detect by checking the following temperature differences during compressor operation. A: Difference in temperature detected by the indoor heat exchanger thermistor (R2T) and the indoor suction air thermistor (R1T)
  • Page 461 Si20-701_B Troubleshooting by Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Does "UF" appear when the power is turned ON? The phase of transmission wiring between the indoor and outdoor units is incorrect.

  • Page 462: And Outdoor Units

    Troubleshooting by Remote Controller Si20-701_B 3.108 Transmission System Abnormality (between Indoor and Outdoor Units) Remote Controller Display Applicable Models RZQ-C7 Method of Error Detection Check transmission between the indoor and outdoor units with a micro-computer when the power is supplied. Error Decision Conditions When wiring connecting the indoor and outdoor units is not proper...
  • Page 463 Si20-701_B Troubleshooting by Remote Controller 3.109 System Error, Refrigerant System Address Undefined Remote Controller Display Applicable Models FMCQ, FMDQ-A7/B7 Method of Error Detection Detect an indoor unit with no address setting. Error Decision Conditions The error decision is made as soon as the abnormality aforementioned is detected.
  • Page 464 Troubleshooting by Remote Controller Si20-701_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution electricity being introduce for the first time after installation or after an indoor or outdoor unit PCB has been replaced? Does...
  • Page 465 Si20-701_B Troubleshooting by Remote Controller Disconnect the outdoor- outdoor unit transmission wiring to create the one-system Mount the DIII- status, and then NET expander check whether or adaptor. not the system is normal. Does a "UH" error occur for all indoor Replace the units in the system? indoor unit PCB.
  • Page 466 Troubleshooting by Remote Controller Si20-701_B 3.110 Check CHECK 1 Check for Fan Motor Connector (Signal Line) (1) Turn the power supply OFF. For except FBQ (2) With the fan motor connector disconnected, measure the resistance between each pin, then make sure that the resistance is more than the value mentioned in the following table.
  • Page 467 Si20-701_B Troubleshooting by Remote Controller CHECK 2 Check for Fan Motor Connector (Power Supply Line) (1) Turn the power supply OFF. With the relay connector disconnected, measure the resistance between UVW phases of the connector (3 cores) at the motor side, then make sure that the resistance between each phase is balanced and not short-circuited.
  • Page 468 Troubleshooting by Remote Controller Si20-701_B Thermistor Resistance / Temperature Characteristics For radiation fin thermistor T°C kΩ T°C kΩ 354.1 5.761 259.7 4.797 192.6 4.014 144.2 3.375 109.1 2.851 83.25 2.418 64.10 2.060 49.70 1.762 38.85 1.513 30.61 1.304 24.29 1.128 19.41 0.9790 15.61...
  • Page 469 Si20-701_B Troubleshooting by Remote Controller For outdoor air thermistor For suction pipe thermistor For heat exchanger thermistor For intermediate heat exchanger thermistor For liquid thermistor For remote controller thermistor T°C kΩ T°C kΩ 361.7719 10.6281 265.4704 8.7097 196.9198 7.1764 147.5687 5.9407 111.6578 4.9439...
  • Page 470 Troubleshooting by Remote Controller Si20-701_B For discharge pipe thermistor T°C kΩ T°C kΩ 3257.371 41.4168 2429.222 34.7923 1827.883 29.3499 1387.099 24.8586 1061.098 21.1360 817.9329 18.0377 635.0831 15.4487 496.5712 13.2768 391.0070 11.4395 309.9511 9.8902 247.2696 8.5788 198.4674 7.4650 160.2244 6.5156 130.0697 5.7038 106.1517 5.0073...
  • Page 471 Si20-701_B Troubleshooting by Remote Controller CHECK 4 Evaluation of Abnormal High Pressure Abnormally high pressure level is mostly caused by the condenser side. The following contents are provided by service engineer based on their field checks. Further, the number is listed in the order of degree of influence.
  • Page 472 Troubleshooting by Remote Controller Si20-701_B In heating operation Check items (Possible causes) Judgement Does the indoor unit fan run Visual inspection normally? Is the indoor unit heat exchanger Visual inspection clogged? Is the indoor unit installed under such conditions that short circuit Visual inspection easily occurs? Check if there is a temperature...
  • Page 473 Si20-701_B Troubleshooting by Remote Controller CHECK 5 Evaluation of Abnormal Low Pressure Abnormally low pressure level is mostly caused by the evaporator side. The following contents are provided based on field checking of service engineer. Further, the number is listed in the order of degree of influence. In cooling operation Check items (Possible causes) Judgement...
  • Page 474 Troubleshooting by Remote Controller Si20-701_B In heating operation Check items (Possible causes) Judgement Does the outdoor unit fan run Visual inspection normally? Is the outdoor unit heat exchanger Visual inspection clogged? Is the outdoor unit installed under such conditions that short circuit Visual inspection easily occurs? Check if there is a temperature...
  • Page 475 Si20-701_B Troubleshooting by Remote Controller CHECK 6 Check for Power Transistor Judgement is made through cable check with an analog tester. (1) Do not touch the energized part (high voltage part) for at least 10 minutes after the power is turned OFF. (2) Be sure to touch the earth terminal with a hand to release static electricity from the body (to prevent PCB from being damaged).
  • Page 476 Troubleshooting by Remote Controller Si20-701_B (6) Using an analog tester, measure resistance and fill in the blanks in the following table. In case of unbalanced resistance for one of the 3 phases in each table (when the resistance value is equal to 5 times or more than the other resistance values), the power transistor is broken.
  • Page 477 Si20-701_B Troubleshooting by Remote Controller CHECK 7 Voltage Measuring Method Outdoor unit PCB Connector Black White Micro-computer A/D input Measure DC voltage here.
  • Page 478 Troubleshooting by Remote Controller Si20-701_B Pressure Sensor for except RZQ(S)-B, RZQ-C7 and CMSQ = 1.38VH-0.69 Detected Pressure : High pressure (MPa) : Output Voltage [High Side] VDC High Pressure (P Output Voltage (V This graph is available for both high pressure sensor and low pressure sensor.
  • Page 479 Si20-701_B Troubleshooting by Remote Controller Pressure Sensor for RZQ(S)-B, RZQ-C7 and CMSQ = 1.38V -0.69 : Output Voltage [High Side] V = 0.57V -0.28 : Output Voltage [Low Side] V : High pressure (MPa) Detected Pressure : Low pressure (MPa) High Pressure (P Low Pressure (P Output Voltage (V...
  • Page 480 Troubleshooting by Remote Controller Si20-701_B CHECK 8 Electronic Expansion Valve Connector and Coil Resistance Criteria Measurement Criteria point (Orange) 1 - 5 3 - 5 (Red) 40~50Ω 2 - 6 (Yellow) 4 - 6 (Black) (Gray) (White)
  • Page 481 Si20-701_B Troubleshooting by Remote Controller CHECK 9 Check for Factors Causing Wet Operation Referring to the Fault Tree Analysis (FTA) shown below, identify the defective points. Defective crankcase heater Refrigerant dwelling Frequent starts and stops of the compressor ← Refer to Excessive refrigerant CHECK 10 charging...
  • Page 482 Troubleshooting by Remote Controller Si20-701_B CHECK 10 Check for Excessive Refrigerant Charging As criteria for judging whether refrigerant is excessively charged or not, refer to the following operating conditions. <Diagnosis of excessive refrigerant charging> In cooling operation (1) Because high pressure rises due to excessive charging, overload control is carried out and capacity tends to run short.
  • Page 483 Si20-701_B Troubleshooting by Remote Controller Cooling As compressor High frequency decreases, low pressure rises. pressure Compressor frequency Maximum frequency pressure decreases due to high pressure protection control Compressor Minimum frequency Compressor frequency frequency increases in order to maintain low pressure. Electronic expansion valve opening degree decreases due to wet protection control...
  • Page 484 Troubleshooting by Remote Controller Si20-701_B CHECK 11 Check for Clogged Points Temperature differences must occur before or after the clogged points! COMP. Indoor Unit Outdoor Unit Check Check points Causes Remedies factor Around Temperature · Dust Replace the electronic expansion difference ·...
  • Page 485 Si20-701_B Troubleshooting by Remote Controller CHECK 12 Check for Inadequate Refrigerant As criteria for judging whether refrigerant is inadequate or not, refer to the following operating conditions. <Diagnosis of inadequate refrigerant> In cooling operation (1) As suction superheated degree increases due to refrigerant shortage, the electronic expansion valve tends to open (opens fully) in order to avoid overheat operation.
  • Page 486 Troubleshooting by Remote Controller Si20-701_B Cooling Abnormal refri g erant shortage Refrigerant shortage warning High pressure Controlled high pressure As compressor frequency decreases, high pressure Actual high pressure decreases. (Maintains a certain level of low pressure) Low pressure When frequency drops to the lowest, it is impossible to maintain a low pressure.
  • Page 487 Si20-701_B Troubleshooting by Remote Controller <Diagnosis of inadequate refrigerant> In heating operation (1) As suction superheated degree increases due to refrigerant shortage, the electronic expansion valve tends to open (opens fully) to avoid overheat operation. (2) As suction superheated degree increases due to refrigerant shortage, compressor frequency decreases because suction superheated degree is controlled in order to prevent oil to the outdoor unit...
  • Page 488 Troubleshooting by Remote Controller Si20-701_B Heating Refrigerant shortage warning Abnormal refri g erant shortage (Maintains a certain As compressor frequency level of high pressure) decreases, high pressure High pressure decreases. Indoor heat exchanger temperature (Th2) Suction air temperature (Th1) Low pressure A decrease in evaporator capacity frequently puts the system in defrost operation.
  • Page 489 Si20-701_B Troubleshooting by Remote Controller CHECK 13 Fan Motor Pulse Check (1) Set operation OFF and power OFF. Disconnect the connector. (2) Check that the voltage between the pins 3 - 4 is about 15 VDC. (3) Check that the voltage between the pins 1 - 4 is about 5 VDC.
  • Page 490 Troubleshooting by Remote Controller Si20-701_B CHECK 14 Check for causes of rise in high pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. ← Check to be sure the stop Stop valve closed valve is open. ←...
  • Page 491 Si20-701_B Troubleshooting by Remote Controller ← Is the suction air Short circuit High suction temperature less than [In cooling] 43˚C? temperature of ← Is the outdoor temperature High outdoor outdoor unit less than 43˚C? temperature High suction ← Is the suction air Short circuit temperature High suction...
  • Page 492 Troubleshooting by Remote Controller Si20-701_B CHECK 15 Check for causes of drop in low pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. ← Are the electrical Defective low pressure characteristics normal? Defective sensor [In cooling] compressor (∗1) capacity...
  • Page 493 Si20-701_B Troubleshooting by Remote Controller ← Is the suction air Short circuit [In cooling] Low suction temperature more than 14˚C? temperature of ← Is the room temperature Low room indoor unit temperature less than 14˚C? ← Is the connector properly Defective suction air Low suction connected?
  • Page 494 Troubleshooting by Remote Controller Si20-701_B Note: ∗1. For details of compressor capacity control while in cooling, refer to “Compressor PI control”. ∗2. The “low pressure protection control” includes low pressure protection control and hot gas bypass control. ∗3. In cooling, the indoor unit electronic expansion valve is used for “superheated degree control”.
  • Page 495 Si20-701_B Troubleshooting by Remote Controller CHECK 16 Method of Checking the Inverter’s Power Transistors and Diode Modules Checking failures in power semiconductors mounted on inverter PCB (A3P) Check the power semiconductors mounted on the inverter PCB by the use of a multiple tester. <Items to be prepared>...
  • Page 496 Troubleshooting by Remote Controller Si20-701_B Electronic circuit IGBT X10A X11A According to the checking aforementioned, it is probed that the error results from the defective inverter. The following section describes supposed causes of the defective inverter. 1 Defective compressor (ground leakage) 1 Defective fan motor (ground leakage) 1 Entry of conductive foreign particles 1 Abnormal voltage (e.g.
  • Page 497 Si20-701_B Troubleshooting by Remote Controller 1. Power module checking When using the analog type of multiple tester, make measurement in resistance measurement mode in Ω range. the x1k Measuring point Criterion Remark 2 to 15kΩ It may take Not less time to than determine the...
  • Page 498 Troubleshooting by Remote Controller Si20-701_B 2. Diode module checking When using the analog type of multiple tester, make measurement in resistance measurement mode in Ω range. the x1k Measuring point Criterion Remark 2 to 15kΩ It may take Not less time to than determine the...
  • Page 499 Si20-701_B Troubleshooting by Remote Controller CHECK 17 Broken Wire Check of the Connecting Wires 1. Procedure for checking outdoor-outdoor unit transmission wiring for broken wires On the system shown below, turn OFF the power supply to all equipment, short circuit between the outdoor-outdoor unit terminal F1 and F2 in the "Outdoor Unit A"...
  • Page 500 Troubleshooting by Remote Controller Si20-701_B and F2 of the "Indoor Unit a" that is farthest from the "Outdoor Unit C" using a multiple meter. If there is continuity between the said transmission wirings, the indoor-outdoor unit transmission wiring has no broken wires in it.
  • Page 501 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

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