Daikin AT12BV1LS Pocket Manual
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Daikin AT12BV1LS Pocket Manual

Service diagnosis split & multi
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Service Diagnosis
SPLIT & MULTI
Si10-417

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Summary of Contents for Daikin AT12BV1LS

  • Page 1 Si10-417 Pocket Manual Service Diagnosis SPLIT & MULTI...

  • Page 2: Table Of Contents

    Si10-417 1. Diagnosis by LED ......2 1.1 Indoor Unit ........2 1.2 Outdoor Unit ........4 2. Diagnosis by Remote Controller ..6 2.1 To know the error code....6 3. List of applicable models ...11 3.1 Indoor Units ......... 11 3.2 Outdoor Units ......

  • Page 3: Diagnosis By Led

    Diagnosis by LED Si10-417 1. Diagnosis by LED 1.1 Indoor Unit The operation lamp flashes when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation.
  • Page 4 Si10-417 Diagnosis by LED Floor Ceiling Suspended Dual Type OPERATION lamp (green) Floor Standing Type O F F OPERATION lamp (green) Duct Connected Type OPERATION lamp (green) Service Diagnosis...

  • Page 5: Outdoor Unit

    Diagnosis by LED Si10-417 1.2 Outdoor Unit Pair The outdoor unit has one green LED (LED A) on the PCB. The flashing green LED indicates normal condition of microcomputer operation. Service Diagnosis...
  • Page 6 Si10-417 Diagnosis by LED Multi There are green and red LEDs on the PCB. The flashing green LED indicates normal equipment condition, and the OFF condition of the red LED indicates normal equipment condition. (Troubleshooting with the green LED) The LED A (green) of the outdoor unit indicate microcomputer operation condition.

  • Page 7: Diagnosis By Remote Controller

    Diagnosis by Remote Controller Si10-417 2. Diagnosis by Remote Controller 2.1 To know the error code Method 1 1. When the timer cancel button is held down for 5 seconds, a “00” indication flashes on the temperature display section. Service Diagnosis...
  • Page 8 Si10-417 Diagnosis by Remote Controller 2. Press the timer cancel button repeatedly until a continuous beep is produced. The code indication changes in the sequence shown below, and notifies with a long beep. Code Code Note: 1. A short beep and two consecutive beeps indicate non- corresponding codes.
  • Page 9 Diagnosis by Remote Controller Si10-417 Method 2 1. Enter the diagnosis mode. Press the 3 buttons (TEMP ,TEMP , MODE) simultaneously. The digit of the number of tens blinks. Try again from the start when the digit does not blink. 2.
  • Page 10 Si10-417 Diagnosis by Remote Controller 3. Diagnose by the sound. “ pi ” : The number of tens does not accord with the error code. “ pi pi ” : The number of tens accords with the error code. “ beep ” : The both numbers of tens and units accord →...
  • Page 11 Diagnosis by Remote Controller Si10-417 6. Diagnose by the sound. “ pi ” : The both numbers of tens and units do not accord with the error code. “ pi pi ” : The number of tens accords with the error code.

  • Page 12: List Of Applicable Models

    Follow the classification Nos. in the table below and check the related page according to the table on page 21. 3.1 Indoor Units 3.1.1 Wall Mounted Type Classification Classification Model Model AT12BV1LS FTK35AVM(A)(T) AT18BV1LS FTK35AZVMB ATK25BVMB FTK35BVMB ATK35BVMB FTK50AVM(A)(T) ATKS20CVMB(9)
  • Page 13 List of applicable models Si10-417 Classification Classification Model Model FTKE35BVM FTX35BVMB FTKE35BVMA(9) FTX50AMVMC FTKE35BVMD FTX50AVMA FTKE35BVMT FTX50AVMC FTKS20CVMB(9) FTX50AVMT FTKS25BVMB FTX60AMVMC FTKS25CVMB(9)(8) FTX60AVMA FTKS35BVMB FTX60AVMC FTKS35CVMB(9)(8) FTX60AVMT FTKS50BVMA(9) FTX71AMVMC FTKS50BVMB FTX71AVMA FTKS60BVMA(9) FTX71AVMC FTKS60BVMB FTX71AVMT FTKS71BVMA(9) FTXD50BMVMC FTKS71BVMB FTXD50BV4(9) FTN20CVMB9 FTXD50BVMA(9) FTN25CVMB9 FTXD50BVMC...
  • Page 14 Si10-417 List of applicable models Classification Classification Model Model FTXE35BVMT FTXS71BVMB FTXS20CVMB(9) FTY25CVMA FTXS25BVMB(A) FTY35CVMA FTXS25CVMB(9)(8) FTYN20CVMB9 FTXS35BVMB(A) FTYN25CVMB9 FTXS35CVMB(9)(8) FTYN35CVMB9 FTXS50BVMA(9) FTYS20BVMB FTXS50BVMB FTYS25BVMB FTXS60BVMA(9) FTYS35BVMB FTXS60BVMB FTYS50BVMB FTXS71BVMA(9) FTYS60BVMB Refer the classification No. to page 21 Service Diagnosis...
  • Page 15 List of applicable models Si10-417 3.1.2 Floor Standing Type Classification Model FVK25AZVMB FVK35AZVMB FVK50AZVMB FVKS25BVMB FVKS35BVMB FVKS50BVMB FVX25AZVMB FVX35AZVMB FVX50AZVMB FVX56AV1C FVXD56CMV2C FVXD68CMV2C FVXS25BVMB FVXS35BVMB(A) FVXS50BVMB(A) Refer the classification No. to page 21 Service Diagnosis...
  • Page 16 Si10-417 List of applicable models 3.1.3 Duct Connected Type Classification Classification Model Model CDK25AVM CDX35AZVMB CDK25AVMA CDX35BVMC(9) CDK25AVMD CDX50AVMA CDK25AZVMB CDX50AVMC(9) CDK35AVM CDX50AZVMB CDK35AVMA CDX60AVMA CDK35AVMD CDX60AVMC(9) CDK35AZVMB CDX60AZVMB CDK50AVM CDXD25AVMC CDK50AVMA CDXD25BMVMC CDK50AVMD CDXD25CMVMC CDK50AZVMB CDXD25CVMA CDK60AVM CDXD35AVMC CDK60AVMA CDXD35BMVMC CDK60AVMD CDXD35CMVMC...
  • Page 17 List of applicable models Si10-417 3.1.4 Floor / Ceiling Suspended Dual Type Classification Model FLK25AVMA FLK25AVMD FLK25AZVMB FLK25BVMB FLK35AVMA FLK35AVMD FLK35AZVMB FLK35BVMB FLK50AVMA FLK50AVMD FLK50AZVMB FLK60AVMA FLK60AVMD FLK60AZVMB FLKS25BVMB FLKS35BVMB FLKS50BVMB FLKS60BVMB FLX25AVMA FLX25AZVMB FLX25BVMB FLX35AVMA FLX35AZVMB FLX35BVMB FLX50AVMA FLX50AZVMB FLX60AVMA FLX60AZVMB FLXS25BVMB(A)

  • Page 18: Outdoor Units

    Si10-417 List of applicable models 3.2 Outdoor Units Classification Classification Model Model 2AMKS40BVMB 4MKD75BVM 2AMXS40BVMB 4MKS58BVMB 2MK58AVM 4MKS75BVMB 2MK58AVM 4MX68AZVMB 2MKD58BVM 4MXS68BVMB 2MKS40BVMB 4MXS68BVMB9 2MXS40BVMB AR09BV1LS 3AMXS52BVMB AR25AV1B 3MK58AVM AR25AV1B9 3MK58AVM AR35AV1B 3MK75AVM AR35AV1B9 3MK75AVM ARK25BVMB 3MK75AVMA ARK35BVMB 3MK75AVMT ARKH20CVMB9 3MKD58BVM ARKH25CVMB9 3MKD75BVM...
  • Page 19 List of applicable models Si10-417 Classification Classification Model Model R35JV17 RKD60JVE R35JV1A RKD60JVEA RE09JV1LS RKD60JVET RE12JV1LS RKD71BVM RE25JV1 RKD71BVMA RE25JV1C RKD71BVMT RE35JV1 RKD71JVE RE35JV1C RKD71JVEA REY22GV1B RKD71JVET REY35GV1B RKD80BVMA RK25BVMB RKE09BVMS RK25JAVET RKE12BVMS RK25JV1NB9 RKE25BVM RK25JVE9 RKE25BVMA RK25JVEA9 RKE25BVMT RK35BVMB RKE35BVM RK35JAVET RKE35BVMA...
  • Page 20 Si10-417 List of applicable models Classification Classification Model Model RN35CVMB9 RXD50JV1B RS20BVMB RXD50JV1B5 RS25BVMB RXD50JVEA9 RS35BVMB RXD50JVET RS50BVMB RXD60BVMA RS50BVMB RXD60BVMT RS60BVMB RXD60JV1B RX25BVMB RXD60JV1B5 RX25JAVET RXD60JVEA RX25JV1NB5 RXD60JVET RX25JV1NB9 RXD68CMV2C RX25JVEA9 RXD71BMVMC RX25LV1C RXD71BVMA RX25LV1C9 RXD71BVMT RX35BVMB RXD71JV1B RX35JAVET RXD71JV1B5 RX35JV1NB5 RXD71JVEA...
  • Page 21 List of applicable models Si10-417 Classification Classification Model Model RXS60BVMA RYN25CVMB9 RXS60BVMB RYN35CVMB9 RXS71BVMA RYS20BVMB RXS71BVMB RYS25BVMB RY25CVMA RYS35BVMB RY35CVMA RYS50BVMB RYN20CVMB9 RYS60BVMB Refer the classification No. to page 22 Service Diagnosis...

  • Page 22: Error Codes And Description Of Fault

    Si10-417 Error Codes and Description of Fault 4. Error Codes and Description of Fault 4.1 Indoor Unit Classification No. and Code related page Indication Description of Problem Indoor unit PCB abnormality Freeze-up protection function or high pressure control Fan motor or related abnormality Heat exchanger temperature thermistor abnormality Shutter drive motor / shutter limit...

  • Page 23: Outdoor Unit

    Error Codes and Description of Fault Si10-417 4.2 Outdoor Unit Classification No. and Code related page Indication Description of Problem Anti-icing function — — — Freeze-up protection — — — OL activation (compressor overloaded) Compressor lock DC fan lock — Input over current detection Four way valve abnormality Discharge pipe temperature...

  • Page 24: System

    Si10-417 Error Codes and Description of Fault 4.3 System Classification No. and Code related page Indication Description of Problem Normal — — — — Insufficient gas Low-voltage detection — — Over-voltage detection — — Signal transmission error (between indoor and outdoor —...

  • Page 25: Troubleshooting

    Troubleshooting Si10-417 5. Troubleshooting 5.1 Indoor Unit 5.1.1 Indoor Unit PCB Abnormality Remote Controller Display Method of Evaluation of zero-cross detection of power supply by Malfunction indoor unit. Detection Malfunction When there is no zero-cross detection in approximately Decision 10 continuous seconds. Conditions Supposed Faulty indoor unit PCB...
  • Page 26 Si10-417 Troubleshooting 5.1.2 Freeze-up Protection Control or High Pressure Control Remote Controller Display Method of High pressure control (heat pump model only) During heating operations, the temperature detected Malfunction by the indoor heat exchanger thermistor is used for Detection the high pressure control (stop, outdoor fan stop, etc.) The freeze-up protection control (operation halt) is activated during cooling operation according to the temperature detected by the indoor unit heat...
  • Page 27 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check the air passage. Check No.6 Refer to Is there any Provide sufficient air P.157 short-circuit? passage. Check the intake air filter.
  • Page 28 Si10-417 Troubleshooting 5.1.3 Fan Motor (AC Motor) or Related Abnormality Remote Controller Display The rotation speed detected by the Hall IC during fan Method of Malfunction motor operation is used to determine abnormal fan Detection motor operation. Malfunction When the detected rotation speed is less than 50% of Decision the HH tap under maximum fan motor rotation demand.
  • Page 29 Troubleshooting Si10-417 Check No. 16 Check hall IC Is there Replace the fan motor an output? or indoor unit PCB. Check the fan motor voltage. Is it at the Replace indoor unit rated voltage? PCB (1). Replace the fan motor. (R1946) Service Diagnosis...
  • Page 30 Si10-417 Troubleshooting 5.1.4 Fan Motor (DC Motor) or Related Abnormality Remote Controller Display Method of The rotation speed detected by the Hall IC during fan Malfunction motor operation is used to determine abnormal fan Detection motor operation. Malfunction When the detected rotation speed is less than 50% of Decision the H tap under maximum fan motor rotation demand.
  • Page 31 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Turn off power supply and rotate fan by hand. Check No.1 Refer to Does Replace fan motor. fan rotate smoothly? P.149 Turn power ON and operate...
  • Page 32 Si10-417 Troubleshooting Turn off power supply and disconnect fan motor conn- ector, then turn power ON. Check No.01 Check output of fan motor connector Is motor power voltage DC 200V Replace indoor unit generated? PCB (1) . Is motor control power voltage DC 15V generated? Turn off power supply and dis-...
  • Page 33 Troubleshooting Si10-417 5.1.5 Thermistor or Related Abnormality (Indoor Unit) C4, C9 Remote Controller Display Method of The temperatures detected by the thermistors are used Malfunction to determine thermistor errors. Detection Malfunction When the thermistor input is more than 4.96 V or less Decision than 0.04 V during compressor operation*.
  • Page 34 Si10-417 Troubleshooting 5.1.6 Shutter Drive Motor / Shutter Limit Switch Abnormality Remote Controller Display Method of The shutter open / close performance is detected by the Malfunction limit switch attached on its structure. In this way, the Detection shutter drive motor and the shutter limit switch are checked for failure.
  • Page 35 Troubleshooting Si10-417 Shutter Check the shutter's opening itself? sealing material. Check the shutter for deformation or its sealing material. Relay harness broken or connector Reconnect the disconnected? connector or replace the relay harness. Replace the shutter drive motor or the PC board (2).

  • Page 36: Outdoor Unit

    Si10-417 Troubleshooting 5.2 Outdoor Unit 5.2.1 Anti-icing Function Remote Controller Display Method of Indoor unit icing, during cooling operation, is detected by checking the temperatures sensed by the indoor unit Malfunction Detection heat exchanger temperature thermistor and room temperature thermistor that are located in a shut-down room.
  • Page 37 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check the wiring and piping. Check No.4 Refer to Wiring or Correct the wiring or P.151 piping out of spec? piping error.
  • Page 38 Si10-417 Troubleshooting 5.2.2 Freeze-up Protection Control Remote Controller Display Outdoor Unit LED Display Method of Indoor unit icing, during cooling operation, is detected by Malfunction checking the temperatures sensed by the indoor unit Detection heat exchanger thermistor and room temperature thermistor that are located in a shut-down room.
  • Page 39 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. shooting Check the wiring and piping. Check No.4 Refer to Wiring or Activate the wiring piping out of spec? P.151 error check mode.
  • Page 40 Si10-417 Troubleshooting 5.2.3 OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor Malfunction Detection Malfunction If the compressor OL is activated twice, the system will be shut down. Decision The error counter will reset itself if this or any other Conditions error does not occur during the following 60-minute compressor running time (total time).
  • Page 41 Troubleshooting Si10-417 5.2.4 OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor Malfunction Detection Malfunction If the compressor OL is activated twice, the system will be shut down. Decision The error counter will reset itself if this or any other Conditions error does not occur during the following 60-minute compressor running time (total time).
  • Page 42 Si10-417 Troubleshooting 5.2.5 OL Activation (Compressor Overload) Remote Controller Display Outdoor Unit LED Display Method of A compressor overload is detected through compressor Malfunction Detection Malfunction If the compressor OL is activated twice, the system will be shut down. Decision The error counter will reset itself if this or any other Conditions error does not occur during the following 60-minute...
  • Page 43 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.4 Refer to P.151 Malfunctioning Check No. 6 Replace the discharge Check the thermistors ∗...
  • Page 44 Si10-417 Troubleshooting 5.2.6 Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the Malfunction compressor running condition through the position Detection detection circuit. Malfunction The system judges the compressor lock, and stops due to over current. Decision The system judges the compressor lock, and cannot Conditions...
  • Page 45 Troubleshooting Si10-417 5.2.7 Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the Malfunction compressor running condition through the position Detection detection circuit. Malfunction The position detection circuit detects a compressor frequency of below 10 Hz for 20 seconds or a Decision frequency of above 160 Hz.
  • Page 46 Si10-417 Troubleshooting 5.2.8 Compressor Lock Remote Controller Display Outdoor Unit LED Display Method of A compressor lock is detected by checking the Malfunction compressor running condition through the position Detection detection circuit. Malfunction The position detection circuit detects a compressor frequency of below 10 Hz for 20 seconds or a Decision frequency of above 160 Hz.
  • Page 47 Troubleshooting Si10-417 System shut down after errors Check the electronic repeated several expansion valve. times? Replace it as required. Replace the compressor. (R2842) Service Diagnosis...
  • Page 48 Si10-417 Troubleshooting 5.2.9 Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the Malfunction compressor running condition through the position Detection detection circuit. Malfunction The position detection circuit detects a compressor frequency of below 5 Hz for several tens of seconds. Decision The system will be shut down if the error occurs 16 Conditions...
  • Page 49 Troubleshooting Si10-417 5.2.10 DC Fan Lock Remote Controller Display Method of A fan motor or related error is detected by checking the Malfunction high-voltage fan motor rpm being detected by the hall IC. Detection Malfunction The fan does not start in 30 seconds even when the fan motor is running.
  • Page 50 Si10-417 Troubleshooting 5.2.11 DC Fan Lock Remote Controller Display Outdoor Unit LED Display Method of A fan motor line error is detected by checking the high- Malfunction voltage fan motor rpm being detected by the Hall IC. Detection Malfunction The fan does not start in 30 seconds even when the fan motor is running.
  • Page 51 Troubleshooting Si10-417 5.2.12 Input Over Current Detection Remote Controller Display Method of An input over-current is detected by checking the input Malfunction current value being detected by CT with the compressor Detection running. Malfunction The following CT input with the compressor running continues for 2.5 seconds.
  • Page 52 Si10-417 Troubleshooting Turn off the power, and reconnect the harnesses. Turn on the power again and get restarted. Check No. 8 Check the discharge pressure. Check No. 7-1 Check the installation condition. (R2952) Note: If the model doesn’t have SPM, replace the outdoor unit PCB.
  • Page 53 Troubleshooting Si10-417 5.2.13 Input Over Current Detection Remote Controller Display Method of An input over-current is detected by checking the input Malfunction current value being detected by CT with the compressor Detection running. Malfunction The following CT input with the compressor running continues for 2.5 seconds.
  • Page 54 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting disconnect connector, or parts damage may be occurred. Caution ∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input Check over-current, take the following procedure.
  • Page 55 Troubleshooting Si10-417 5.2.14 Input Over Current Detection Remote Controller Display Outdoor Unit LED Display Method of An input over-current is detected by checking the input Malfunction current value being detected by CT with the compressor Detection running. Malfunction The following CT input with the compressor running continues for 2.5 seconds.
  • Page 56 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting disconnect connector, or parts damage may be occurred. Caution ∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input Check over-current, take the following procedure.
  • Page 57 Troubleshooting Si10-417 5.2.15 Input Over Current Detection Remote Controller Display Method of An input over-current is detected by checking the input Malfunction current value being detected by CT with the compressor Detection running. Malfunction The following CT input with the compressor running continues for 2.5 seconds.
  • Page 58 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. ∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input over-current, take the following procedure.
  • Page 59 Troubleshooting Si10-417 5.2.16 Four Way Valve Abnormality Remote Controller Display Method of The liquid pipe temperature thermistor, the outdoor air Malfunction temperature thermistor and the outdoor unit heat Detection exchanger thermistor are checked to see if they function within their normal ranges in the operating mode. Malfunction A following condition occurs after 3 minutes of the Decision...
  • Page 60 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting disconnect connector, or parts damage may be occurred. Caution Four way valve coil disconnected Check Correct. (loose)? No.5-2 Refer to P.156 Harness Reconnect. out of connector? Check No.6 Check the continuity of the four Refer to...
  • Page 61 Troubleshooting Si10-417 5.2.17 Four Way Valve Abnormality Remote Controller Display Method of The indoor air temperature thermistor, the indoor unit Malfunction heat exchanger thermistor, the outdoor temperature Detection thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.
  • Page 62 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Four way valve coil disconnected Correct. Check (loose)? No.5-2 Refer to P.156 Harness Reconnect. out of connector? Check No.6 Check the continuity of the four Refer to...
  • Page 63 Troubleshooting Si10-417 5.2.18 Four Way Valve Abnormality Remote Controller Display Method of The room temperature thermistor, the indoor unit heat Malfunction exchanger thermistor, the outdoor temperature Detection thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.
  • Page 64 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Four way valve coil disconnected Correct. Check (loose)? No.5-1 Refer to P.155 Harness Reconnect. out of connector? Check No.6 Refer to Check the continuity of the four...
  • Page 65 Troubleshooting Si10-417 5.2.19 Four Way Valve Abnormality Remote Controller Display Outdoor Unit LED Display Method of The liquid pipe thermistor, the outdoor temperature Malfunction thermistor and the outdoor unit heat exchanger Detection thermistor are checked to see if they function within their normal ranges in the operating mode.
  • Page 66 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Four-way valve Correct. coil disconnected Check (loose)? No.5-1 Refer to P.155 Harness out of Reconnect. connector? Check No.6 Check the continuity of the Refer to four-way valve coil and...
  • Page 67 Troubleshooting Si10-417 5.2.20 Discharge Pipe Temperature Control Remote Controller Display Method of The discharge pipe temperature control (stop, frequency Malfunction drooping, etc.) is checked with the temperature being Detection detected by the discharge pipe thermistor. Malfunction If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the system will Decision be shut down.
  • Page 68 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting disconnect connector, or parts damage may be occurred. Caution Check No. 6 Malfunctioning Replace a defective Check the thermistors. Check No.4 Discharge thermistor. pipe Refer to thermistor P.151 Outdoor...
  • Page 69 Troubleshooting Si10-417 5.2.21 Discharge Pipe Temperature Control Remote Controller Display Method of The discharge pipe temperature control (stop, frequency Malfunction drooping, etc.) is checked with the temperature being Detection detected by the discharge pipe thermistor. Malfunction If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the system will Decision be shut down.
  • Page 70 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check No. 6 Malfunctioning Replace a defective Check the thermistors. Discharge Check No.4 thermistor. pipe Refer to thermistor Outdoor P.151...
  • Page 71 Troubleshooting Si10-417 5.2.22 Discharge Pipe Temperature Control Remote Controller Display Outdoor Unit LED Display Method of The discharge pipe temperature control (stop, frequency Malfunction drooping, etc.) is checked with the temperature being Detection detected by the discharge pipe thermistor. Malfunction If a stop takes place 6 times straight due to abnormal discharge pipe temperature, the system will be shut Decision...
  • Page 72 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check No. 6 Malfunctioning Replace a defective Check the thermistors. Discharge Check No.4 thermistor. pipe Refer to thermistor Functioning Outdoor...
  • Page 73 Troubleshooting Si10-417 5.2.23 Discharge Pipe Temperature Control Remote Controller Display Method of The discharge pipe temperature control (stop, frequency Malfunction drooping, etc.) is checked with the temperature being Detection detected by the discharge pipe thermistor. Malfunction If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the system will Decision be shut down.
  • Page 74 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting disconnect connector, or parts damage may be occurred. Caution Check No. 6 Malfunctioning Replace a defective Check the thermistors. Discharge Check No.4 thermistor. pipe Refer to thermistor Functioning Outdoor...
  • Page 75 Troubleshooting Si10-417 5.2.24 High Pressure Control in Cooling Remote Controller Display Method of High-pressure control (stop, frequency drop, etc.) is Malfunction activated in the cooling mode if the temperature being Detection sensed by the heat exchanger thermistor exceeds the limit. Malfunction Activated when the temperature being sensed by the Decision...
  • Page 76 Si10-417 Troubleshooting 5.2.25 High Pressure Control in Cooling Remote Controller Display Method of High-pressure control (stop, frequency drop, etc.) is Malfunction activated in the cooling mode if the temperature being Detection sensed by the heat exchanger thermistor exceeds the limit. Malfunction Activated when the temperature being sensed by the Decision...
  • Page 77 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check the installation space. Check No.4 Refer to Check No.7-2 Abnormal Change the air outlet Installation condition P.151 grille position.
  • Page 78 Si10-417 Troubleshooting 5.2.26 Position Sensor Abnormality Remote Controller Display Method of FTK(X)S, ATK(X)S series only Malfunction A compressor startup failure is detected by checking the Detection compressor running condition through the position detection circuit. Malfunction The compressor fails to start in about 15 seconds after the compressor run command signal is sent.
  • Page 79 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check No. Check for short-circuit. Check No.13 Refer to P.163 Normal Replace the outdoor unit PCB. Check the electrolytic capacitor voltage.
  • Page 80 Si10-417 Troubleshooting 5.2.27 Position Sensor Abnormality Remote Controller Display Method of A compressor startup failure is detected by checking the Malfunction compressor running condition through the position Detection detection circuit. Malfunction The compressor fails to start in about 15 seconds after the compressor run command signal is sent.
  • Page 81 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check No. Check for short-circuit. Check No.13 Refer to Normal Replace the outdoor P.163 unit PCB, outdoor unit fan.
  • Page 82 Si10-417 Troubleshooting 5.2.28 Position Sensor Abnormality Remote Controller Display Outdoor Unit LED Display Method of A compressor startup failure is detected by checking the Malfunction compressor running condition through the position Detection detection circuit. Malfunction The compressor fails to start in about 15 seconds after the compressor run command signal is sent.
  • Page 83 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check No. Check for short-circuit. Check No.13 Refer to P.163 Normal Replace the outdoor unit PCB, outdoor unit fan.
  • Page 84 Si10-417 Troubleshooting 5.2.29 Position Sensor Abnormality Remote Controller Display Method of A compressor startup failure is detected by checking the Malfunction compressor running condition through the position Detection detection circuit. Malfunction The compressor is not running in about 15 seconds after the compressor run command signal is sent.
  • Page 85 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Check No. Check for short-circuit. Check No.13 Refer to P.163 Normal Replace the outdoor unit PCB. Check the electrolytic capacitor voltage.
  • Page 86 Si10-417 Troubleshooting 5.2.30 CT or Related Abnormality Remote Controller Display Method of A CT or related error is detected by checking the Malfunction compressor running frequency and CT-detected input Detection current. Malfunction The compressor running frequency is below 62 Hz and Decision the CT input is below 0.1 V.
  • Page 87 Troubleshooting Si10-417 Turn off the power. Disconnect the harnesses U, V and W. Check with the inverter * Inverter checker checker (∗). Part No.: 1225477 Correct the power Any LED off? supply or replace the SPM. (Replace the outdoor Turn off the power and reconnect unit PCB.) the above harnesses.
  • Page 88 Si10-417 Troubleshooting 5.2.31 CT or Related Abnormality Remote Controller Display Method of A CT or related error is detected by checking the Malfunction compressor running frequency and CT-detected input Detection current. Malfunction The compressor running frequency is below 55 Hz and Decision the CT input is below 0.1 V.
  • Page 89 Troubleshooting Si10-417 Turn off the power. Disconnect the harnesses U, V and W. Check with the inverter * Inverter checker checker (∗). Part No.: 1225477 Correct the power Any LED off? supply or replace the SPM. (Replace the outdoor Turn off the power and reconnect unit PCB.) the above harnesses.
  • Page 90 Si10-417 Troubleshooting 5.2.32 CT or Related Abnormality Remote Controller Display Outdoor Unit LED Display Method of A CT or related error is detected by checking the Malfunction compressor running frequency and CT-detected input Detection current. Malfunction The compressor running frequency is below 55 Hz and Decision the CT input is below 0.1 V.
  • Page 91 Troubleshooting Si10-417 Be sure to turn off power switch before connect or Trouble Caution disconnect connector, or parts damage may be occurred. shooting Turn off the power and turn it on again. Get the system started. Check No.12 Refer to P.163 ∗...
  • Page 92 Si10-417 Troubleshooting 5.2.33 CT or Related Abnormality Remote Controller Display Method of A CT or related error is detected by checking the Malfunction compressor running frequency and CT-detected input Detection current. Malfunction The compressor running frequency is above 68 Hz and Decision the CT input is below 0.1 V.
  • Page 93 Troubleshooting Si10-417 Turn off the power. Disconnect the harnesses U, V and W. Check with the inverter * Inverter checker checker (∗). Part No.: 1225477 Correct the power Any LED off? supply or replace the SPM. (Replace the outdoor Turn off the power and reconnect unit PCB.) the above harnesses.
  • Page 94 Si10-417 Troubleshooting 5.2.34 Thermistor or Related Abnormality (Outdoor Unit) P4, J3, J6, H9 Remote Controller Display Method of This type of error is detected by checking the thermistor Malfunction input voltage to the microcomputer. Detection [A thermistor error is detected by checking the temperature.] Malfunction The thermistor input is above 4.96 V or below 0.04 V...
  • Page 95 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Turn on the power again. Check No.6 Refer to Error Reconnect. displayed again on remote P.157 controller? Connector or thermistor Reconnect.
  • Page 96 Si10-417 Troubleshooting 5.2.35 Thermistor or Related Abnormality (Outdoor Unit) P4, J3, J6, J8, J9, H9 Remote Controller Display Outdoor Unit LED Display Method of This type of error is detected by checking the thermistor Malfunction input voltage to the microcomputer. Detection [A thermistor error is detected by checking the temperature being detected by each thermistor.]...
  • Page 97 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Turn on the power again. Check No.6 Refer to Error displayed again on remote Reconnect. P.157 controller? Connector or thermistor Reconnect.
  • Page 98 Si10-417 Troubleshooting 5.2.36 Thermistor or Related Abnormality (Outdoor Unit) P4,J3,J6,J8,J9,H9 Remote Controller Display Method of This type of error is detected by checking the thermistor Malfunction input voltage to the microcomputer. Detection [A thermistor error is detected by checking the temperature.] Malfunction The thermistor input is above 4.96 V or below 0.04 V...
  • Page 99 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Turn on the power again. Check No.6 Refer to Error P.157 Reconnect. displayed again on remote controller? Connector or thermistor Reconnect.
  • Page 100 Si10-417 Troubleshooting 5.2.37 Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by Malfunction checking the radiation fin thermistor with the compressor Detection off. Malfunction With the compressor off, the radiation fin temperature is Decision above 122°C.
  • Page 101 Troubleshooting Si10-417 Check No. 6 Check the thermistor resistance value. Fin thermistor Check the radiation fin temperature. Thermistor as specified in its Replace the fin characteristic thermistor. chart? Above 122˚C? Replace the outdoor unit PCB. (R2953) Service Diagnosis...
  • Page 102 Si10-417 Troubleshooting 5.2.38 Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by Malfunction checking the radiation fin thermistor with the compressor Detection off. Malfunction With the compressor off, the radiation fin temperature is Decision above 80°C (above 75°C in the case of 7.1kW class).
  • Page 103 Troubleshooting Si10-417 Check No. 6 Check the thermistor resistance value. Fin thermistor Check the radiation fin temperature. Thermistor as specified in its Replace the fin characteristic thermistor. chart? Above 80˚C? Replace the outdoor unit PCB. (R2850) Service Diagnosis...
  • Page 104 Si10-417 Troubleshooting 5.2.39 Electrical Box Temperature Rise Remote Controller Display Outdoor Unit LED Display Method of An electrical box temperature rise is detected by Malfunction checking the radiation fin thermistor with the compressor Detection off. Malfunction With the compressor off, the radiation fin temperature is Decision above 80°C (above 75°C in the case of 8.0 ·...
  • Page 105 Troubleshooting Si10-417 Check No. 6 Check the thermistor resistance value. Fin thermistor Check the radiation fin temperature. Thermistor as specified in its Replace the fin characteristic thermistor. chart? Above 90˚C? Replace the outdoor unit PCB. (R2850) Service Diagnosis...
  • Page 106 Si10-417 Troubleshooting 5.2.40 Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by Malfunction checking the radiation fin thermistor with the compressor Detection off. Malfunction With the compressor off, the radiation fin temperature is Decision above 80°C (above 75°C in the case of 7.1kW class).
  • Page 107 Troubleshooting Si10-417 Check No. 6 Check the thermistor resistance value. Fin thermistor Check the radiation fin temperature. Thermistor as specified in its Replace the fin characteristic thermistor. chart? Above 80˚C? Replace the outdoor unit PCB. (R2850) Service Diagnosis...
  • Page 108 Si10-417 Troubleshooting 5.2.41 Radiation Fin Temperature Rise Remote Controller Display Method of A radiation fin temperature rise is detected by checking Malfunction the radiation fin thermistor with the compressor on. Detection Malfunction If the radiation fin temperature with the compressor on is Decision above 81°C, Conditions...
  • Page 109 Troubleshooting Si10-417 Check No. 6 Check the thermistor resistance value. Fin thermistor Check the radiation fin temperature. Thermistor as specified in its Replace the fin characteristic thermistor. chart? Check the power Above 81˚C? transistor and fin for looseness. If they are found to be fit tightly, replace the PCB or the power transistor.
  • Page 110 Si10-417 Troubleshooting 5.2.42 Radiation Fin Temperature Rise Remote Controller Display Method of A radiation fin temperature rise is detected by checking Malfunction the radiation fin thermistor with the compressor on. Detection Malfunction If the radiation fin temperature with the compressor on is Decision above 90°C, Conditions...
  • Page 111 Troubleshooting Si10-417 Check No. Check the thermistor resistance value. Fin thermistor Check the radiation fin temperature. Thermistor as specified in its characteristic Replace the fin chart? thermistor. Above 90˚C? Check the power transistor and fin for looseness. If they are found to be fit tightly, replace the PCB or the power transistor.
  • Page 112 Si10-417 Troubleshooting 5.2.43 Radiation Fin Temperature Rise Remote Controller Display Outdoor Unit LED Display Method of A radiation fin temperature rise is detected by checking Malfunction the radiation fin temperature being detected by the fin Detection thermistor with the compressor on. Malfunction If the radiation fin temperature with the compressor on is Decision...
  • Page 113 Troubleshooting Si10-417 Check No. 6 Check the thermistor resistance value. Fin thermistor Check the radiation fin temperature. Thermistor as specified in its Replace the fin characteristic thermistor. chart? Check the power Above 90˚C? transistor and fin for looseness. If they are found to be fit tightly, replace the PCB or the power transistor.
  • Page 114 Si10-417 Troubleshooting 5.2.44 Radiation Fin Temperature Rise Remote Controller Display Method of A radiation fin temperature rise is detected by checking Malfunction the radiation fin thermistor with the compressor on. Detection Malfunction If the radiation fin temperature with the compressor on is Decision above 90°C, Conditions...
  • Page 115 Troubleshooting Si10-417 Check No. Check the thermistor resistance value. Fin thermistor Check the radiation fin temperature. Thermistor as specified in its characteristic Replace the fin chart? thermistor. Above 90˚C? Check the power transistor and fin for looseness. If they are found to be fit tightly, replace the PCB or the power transistor.
  • Page 116 Si10-417 Troubleshooting 5.2.45 Output Over Current Detection Remote Controller Display Method of An output over-current is detected by checking the Malfunction current that flows in the inverter DC section. Detection Malfunction A position signal error occurs while the compressor is running.
  • Page 117 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting disconnect connector, or parts damage may be occurred. Caution ∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.
  • Page 118 Si10-417 Troubleshooting Monitor the supply voltage, discharge and suction pressures, and other factors for a long term. Possible causes Instantaneous supply voltage drop Keep on using as it is Compressor motor (monitor). overloaded Contact-induced electrical Check the electricals' short-circuit connectors and other fittings.
  • Page 119 Troubleshooting Si10-417 5.2.46 Output Over Current Detection Remote Controller Display Outdoor Unit LED Display Method of An output over-current is detected by checking the Malfunction current that flows in the inverter DC section. Detection Malfunction A position signal error occurs while the compressor is running.
  • Page 120 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. ∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.
  • Page 121 Troubleshooting Si10-417 Monitor the supply voltage, discharge and suction pressures, and other factors for a long term. Possible causes Instantaneous supply voltage drop Keep on using as it is Compressor motor (monitor). overloaded Contact-induced electrical Check the electricals' short-circuit connectors and other fittings.
  • Page 122 Si10-417 Troubleshooting 5.2.47 Output Over Current Detection Remote Controller Display Method of An output over-current is detected by checking the Malfunction current that flows in the inverter DC section. Detection Malfunction A position signal error occurs while the compressor is running.
  • Page 123 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. ∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.
  • Page 124 Si10-417 Troubleshooting Monitor the supply voltage, discharge and suction pressures, and other factors for a long term. Possible causes Instantaneous supply voltage drop Keep on using as it is Compressor motor (monitor). overloaded Contact-induced electrical Check the electricals' short-circuit connectors and other fittings.

  • Page 125: System

    Troubleshooting Si10-417 5.3 System 5.3.1 Insufficient Gas Remote Controller Display Method of Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current value and the Malfunction Detection compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger...
  • Page 126 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Any thermistor Reconnect in position. disconnected? Check No.4 * Discharge pipe thermistor Refer to * Indoor / outdoor P.151 unit heat exchanger...
  • Page 127 Troubleshooting Si10-417 Check the power Compressor vibrating transistor harness for too much? looseness. Correct it as required. Also replace cracked pipe if any. Check the pipes for improper contact. Correct as required. Also replace cracked pipe if any. Malfunctioning Replace the room Check No.
  • Page 128 Si10-417 Troubleshooting 5.3.2 Insufficient Gas Remote Controller Display Method of Gas shortage detection I : A gas shortage is detected by Malfunction checking the CT-detected input current value and the Detection compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger...
  • Page 129 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Any thermistor Reconnect in position. disconnected? * Discharge pipe thermistor Check No.4 * Indoor / outdoor Refer to unit heat exchanger P.151...
  • Page 130 Si10-417 Troubleshooting Check the power Compressor vibrating transistor harness for too much? looseness. Correct it as required. Also replace cracked pipe if any. Check the pipes for improper contact. Correct as required. Also replace cracked pipe if any. Malfunctioning Replace the room Check No.
  • Page 131 Troubleshooting Si10-417 5.3.3 Insufficient Gas Remote Controller Display Outdoor Unit LED Display Method of Gas shortage detection I : A gas shortage is detected by Malfunction checking the CT-detected input current value and the Detection compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger...
  • Page 132 Si10-417 Troubleshooting Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Any thermistor Reconnect in position. disconnected? * Discharge pipe Check No.4 thermistor * Indoor / outdoor Refer to unit heat P.151 exchanger...
  • Page 133 Troubleshooting Si10-417 Check the power Compressor vibrating transistor harness for too much? looseness. Correct it as required. Also replace cracked pipe if any. Check the pipes for improper contact. Correct as required. Also replace cracked pipe if any. Malfunctioning Replace the room Check No.
  • Page 134 Si10-417 Troubleshooting 5.3.4 Insufficient Gas Remote Controller Display Method of Gas shortage detection I : A gas shortage is detected by Malfunction checking the power consumption value and the Detection compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger...
  • Page 135 Troubleshooting Si10-417 Trouble Be sure to turn off power switch before connect or shooting Caution disconnect connector, or parts damage may be occurred. Any thermistor Reconnect in position. disconnected? * Discharge pipe Check No.4 thermistor * Indoor / outdoor Refer to unit heat exchanger P.151...
  • Page 136 Si10-417 Troubleshooting Check the power Compressor vibrating transistor harness for too much? looseness. Correct it as required. Also replace cracked pipe if any. Check the pipes for improper contact. Correct as required. Also replace cracked pipe if any. Malfunctioning Replace the room Check No.
  • Page 137 Troubleshooting Si10-417 5.3.5 Over-voltage Detection Remote Controller Display Method of An abnormal voltage rise is detected by checking the Malfunction specified over-voltage detection circuit. Detection Malfunction An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer (The voltage is Decision over 400V).
  • Page 138 Si10-417 Troubleshooting 5.3.6 Low-voltage Detection Remote Controller Display Method of An abnormal voltage rise or drop is detected by checking Malfunction the detection circuit or DC voltage detection circuit. Detection Malfunction An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or the voltage Decision being detected by the DC voltage detection circuit is Conditions...
  • Page 139 Troubleshooting Si10-417 5.3.7 Low-voltage Detection Remote Controller Display Outdoor Unit LED Display Method of An abnormal voltage rise or drop is detected by checking Malfunction the detection circuit or DC voltage detection circuit. Detection Malfunction An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or the voltage Decision being detected by the DC voltage detection circuit is...
  • Page 140 Si10-417 Troubleshooting Trouble shooting Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Caution Check the supply voltage. Supply voltage as Correct the power specified? supply. Turn on the power again. System restarted? Repeat a couple of times.
  • Page 141 Troubleshooting Si10-417 5.3.8 Over-voltage Detection Remote Controller Display Method of An abnormal voltage rise is detected by checking the Malfunction detection circuit or DC voltage detection circuit. Detection Malfunction An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or more than Decision 430 V occurred the voltage detected by the DC Conditions...
  • Page 142 Si10-417 Troubleshooting Trouble shooting Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Caution Check the supply voltage. Supply voltage as Correct the power specified? supply. Turn on the power again. System restarted? Repeat a couple of times.
  • Page 143 Troubleshooting Si10-417 5.3.9 Signal Transmission Error (between Indoor and Outdoor Units) Remote Controller Display Method of The data received from the outdoor unit in indoor unit- Malfunction outdoor unit signal transmission is checked whether it is Detection normal. Malfunction When the data sent from the outdoor unit cannot be Decision received normally, or when the content of the data is Conditions...
  • Page 144 Si10-417 Troubleshooting Be sure to turn off power switch before connect or Trouble Caution disconnect connector, or parts damage may be occurred. shooting Check the indoor unit-outdoor unit connection wires. Is there any wiring Correct the indoor Check No.10 error? unit-outdoor unit Refer to connection wires.
  • Page 145 Troubleshooting Si10-417 5.3.10 Outdoor Unit PCB Abnormality or Signal Transmission Circuit Abnormality Remote Controller Display Method of The data received from the outdoor unit in indoor unit- Malfunction outdoor unit signal transmission is checked whether it is Detection normal. Malfunction When the data sent from the outdoor unit cannot be Decision received normally, or when the content of the data is...
  • Page 146 Si10-417 Troubleshooting Trouble shooting Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Check the indoor unit-outdoor unit connection wires. Correct the indoor Is there any wiring error? unit-outdoor unit connection wires.
  • Page 147 Troubleshooting Si10-417 5.3.11 Unspecified Voltage (between Indoor and Outdoor Units) Remote Controller Display Method of The supply power is detected for its requirements Malfunction (different from separate type and multi type) by the Detection indoor / outdoor transmission signal. Malfunction The separate type and multi type are interconnected.
  • Page 148 Si10-417 Troubleshooting 5.3.12 Anti-icing Function in Other Rooms / Unspecified Voltage (between Indoor and Outdoor Units) UA, UH Remote Controller Display Outdoor Unit LED Display Method of A wrong connection is detected by checking the Malfunction combination of indoor and outdoor units on the Detection microcomputer.
  • Page 149 Troubleshooting Si10-417 5.3.13 Anti-icing Function in Other Rooms / Unspecified Voltage (between Indoor and Outdoor Units) UA,UH Remote Controller Display Method of A wrong connection is detected by checking the Malfunction combination of indoor and outdoor units on the Detection microcomputer.

  • Page 150: Check

    Si10-417 Troubleshooting 5.4 Check 5.4.1 Fan Motor Connector Output Check Check 1. Check connector connection. 2. Check motor power supply voltage output No.01 (pins 4-7 and 4-8). 3. Check motor control voltage (pins 4-3). 4. Check rotation command voltage output (pins 4-2). 5.
  • Page 151 Troubleshooting Si10-417 Check 1. Check connector connection. 2. Check motor control voltage output (pins 2-1). No.02 S202 Motor power supply voltage Unused Unused P.0V (reference potential) Motor control power supply (R1073) 5.4.2 Limit Switch Continuity Check Check Remove the front grille. The limit switch is located at the left side of the drain pan assembly.
  • Page 152 Si10-417 Troubleshooting 5.4.3 Electronic Expansion Valve Check Check No.4 Conduct the followings to check the electronic expansion (for Pair valve (EV). System) 1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the connector number.
  • Page 153 Troubleshooting Si10-417 Check No.4 Conduct the followings to check the electronic expansion (for Multi valve (EV). System) 1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the connector number. 2. Turn the power off and back on again, and check to see if all the EVs generate latching sound.
  • Page 154 Si10-417 Troubleshooting Valve Body Condition Check Method / Measure (Symptom) Reset power supply and (1) Valve body catches conduct cooling operation unit at fully opened or half by unit opened position. Check the liquid pipe (Symptom) temperature of no- Cooling: operation unit.
  • Page 155 Troubleshooting Si10-417 Valve Body Condition Check Method / Measure (Symptom) (3) Valve does not Check the number of rotation open fully. of shaft if it is 5 and half from (Symptom) full open to complete close The unit does not using manual coil for cool nor heat (only for electronic expansion valve.
  • Page 156 Si10-417 Troubleshooting 5.4.4 Four Way Valve Performance Check Check No.5-1 Turn off the power and turn it on again. ∗ Four way valve coil Start the heating-mode run. Cooling / dry : No continuity Heating : Continuity S80 voltage at DC 180-220 V with Replace the outdoor compressor on? unit PCB.
  • Page 157 Troubleshooting Si10-417 Check No.5-2 Turn off the power and turn it on again. ∗ Four way valve coil Start the heating-mode run. Cooling / dry : No continuity Heating : Continuity S80 voltage at DC 180-220 V with Replace the outdoor compressor on? unit PCB.
  • Page 158 Si10-417 Troubleshooting 5.4.5 Thermistor Resistance Check Check No.6 Remove the connectors of the thermistors on the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the graph and the table below. Thermistor R25°C=20kΩ...
  • Page 159 Troubleshooting Si10-417 5.4.6 Installation Condition Check Check No.7-1 Installation condition check Check the allowable Abnormal dimensions of the air suction Change the position of and discharge the air discharge grille area. or the installation location. Normal Does the discharged air from other outdoor unit cause an increase of Change the position of the suction air...
  • Page 160 Si10-417 Troubleshooting Check No.7-2 Installation condition check Check the allowable Abnormal dimensions of the air suction Change the position of and discharge the air discharge grille area. or the installation location. Normal Does the discharged air from other outdoor unit cause an increase of Change the position of the air discharge grille the suction air...
  • Page 161 Troubleshooting Si10-417 5.4.7 Discharge Pressure Check Check No.8 Discharge pressure check High Replace compessor. Open the stop valve. Is the stop valve open? Is the connection Replace the pipe pipe deformed? installed at the site. the heat exchanger and Clean. air filter dirty? Replace the compressor.
  • Page 162 Si10-417 Troubleshooting With AC Motor Check the outdoor fan system. Abnormal Check the Does the fan motor lead wire Repair. outdoor fan rotate? connector for secure connection. Normal Does Are the the outdoor unit fan resistance at connector Replace the leads ∞? 1.
  • Page 163 Troubleshooting Si10-417 5.4.9 Power Supply Waveforms Check Check Measure the power supply waveform between pins 1 No.10 and 3 on the terminal board, and check the waveform disturbance. Check to see if the power supply waveform is a sine wave (Fig.1). Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2) [Fig.1]...
  • Page 164 Si10-417 Troubleshooting 5.4.11 Capacitor Voltage Check Check Checking the capacitor voltage With the circuit breaker still on, measure the voltage at No.12 the power transistor (+) and (-) terminals. Set the multi-tester to DC and VOLTAGE RANGE before measurement. Be careful never to touch any live parts.
  • Page 165 Troubleshooting Si10-417 5.4.13 Main Circuit Electrolytic Capacitor Check Check Checking the main circuit electrolytic capacitor Never touch any live parts for at least 10 minutes after No.14 turning off the circuit breaker. If unavoidably necessary to touch a live part, make sure there is no DC voltage using the tester.
  • Page 166 Si10-417 Troubleshooting 5.4.14 Turning Speed Pulse Input on the Outdoor Unit PCB Check Check <Propeller fan motor> No.15-1 Make sure the voltage of 270±30V is being applied. (1) Stop the operation first and then the power, and disconnect the connector S70. (2) Make sure there is about DC 270 V between pins 4 and 7.
  • Page 167 Troubleshooting Si10-417 Check <Propeller fan motor> No.15-2 Make sure the voltage of 290~380V is being applied. (1) Stop the operation first and then the power off, and disconnect the connector S70. (2) Make sure there is about DC 280 V between pins 4 and 7.
  • Page 168 Si10-417 Troubleshooting 5.4.15 Hall IC Check Check 1. Check the connector connection. No.16 2. With the power ON, operation OFF, and the connector connected, check the following. ∗Output voltage of about 5 V between pins 1 and 3. ∗Generation of 3 pulses between pins 2 and 3 when the fan motor is operating.
  • Page 169 2-chome, Kita-ku, Osaka, 530-8323 Japan Tokyo Office: JR Shinagawa East Bldg., 18-1, Konan 2-chome, Minato-ku, Tokyo, 108-0075 Japan http://www.daikin.com/global/ All rights reserved The specifications, designs, and information in this brochure are subject to change without notice. Printed in Japan 09/2004 AK...

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