Daikin RTSQ20PY1 Service Manual page 5

SiBE31-801_C
5. Troubleshooting (OP: Centralized Remote Controller) .......................323
Table of Contents
4.28 "J5" Outdoor Unit: Malfunction of Thermistor (R8T) for
Suction Pipe .........................................................................................265
4.29 "J6" Outdoor Unit: Malfunction of Thermistor (R4T) for
Outdoor Unit Heat Exchanger ..............................................................266
4.30 "J7" Outdoor Unit: Malfunction of Liquid Pipe Thermistor 1
(R6T or R9T) ........................................................................................267
4.31 "J8" Outdoor Unit: Malfunction of Liquid Pipe Thermistor 2 (R7T)........268
4.32 "J9" Outdoor Unit: Malfunction of
Subcooling Heat Exchanger Gas Pipe Thermistor (R5T).....................269
4.33 "JA" Outdoor Unit: Malfunction of High Pressure Sensor......................270
4.34 "JC" Outdoor Unit: Malfunction of Low Pressure Sensor ......................272
4.35 "L1" Outdoor Unit: Defective Inverter PCB............................................274
4.36 "L4" Outdoor Unit: Malfunction of
Inverter Radiation Fin Temperature Rise .............................................276
4.37 "L5" Outdoor Unit: Momentary Overcurrent of Inverter Compressor ....278
4.38 "L8" Outdoor Unit: Momentary Overcurrent of Inverter Compressor ....280
4.39 "L9" Outdoor Unit: Inverter Compressor Starting Failure ......................282
4.40 "LC" Outdoor Unit: Malfunction of Transmission between
Inverter and Control PCB .....................................................................285
4.41 "P1" Outdoor Unit: Inverter Over-Ripple Protection...............................288
4.42 "P4" Outdoor Unit: Malfunction of
Inverter Radiation Fin Temperature Rise Sensor.................................290
4.43 "PJ" Outdoor Unit: Faulty Field Setting after Replacing Main PCB or
Faulty Combination of PCB ..................................................................291
4.44 "U0" Outdoor Unit: Refrigerant Shortage Alert ......................................293
4.45 "U1" Reverse Phase, Open Phase ........................................................295
4.46 "U2" Outdoor Unit: Power Supply Insufficient or
Instantaneous Failure...........................................................................296
4.47 "U3" Outdoor Unit: Check Operation is not Executed............................299
4.48 "U4" Malfunction of Transmission between Indoor Units.......................300
4.49 "U5" Indoor Unit: Malfunction of Transmission between
Remote Controller and Indoor Unit.......................................................302
4.50 "U7" Outdoor Unit: Transmission Failure (Across Outdoor Units) .........303
4.51 "U8" Indoor Unit: Malfunction of Transmission between
Main and Sub Remote Controllers .......................................................310
4.52 "U9" Indoor Unit: Malfunction of Transmission between
Indoor and Outdoor Units in the Same System....................................311
4.53 "UA" Improper Combination of Indoor and Outdoor Units,
Indoor Units and Remote Controller.....................................................312
4.54 "UC" Address Duplication of Centralized Controller...............................316
4.55 "UE" Malfunction of Transmission between
Centralized Controller and Indoor Unit .................................................317
4.56 "UF" System is not Set yet.....................................................................320
4.57 "UH" Malfunction of System,
Refrigerant System Address Undefined ...............................................321
5.1 "M1" PCB Defect ...................................................................................323
5.2 "M8" Malfunction of Transmission between
Optional Controllers for Centralized Control.........................................324
5.3 "MA" Improper Combination of Optional Controllers for
Centralized Control...............................................................................325
5.4 "MC" Address Duplication, Improper Setting .........................................327
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