Daikin VRVII Manual
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Daikin VRVII Manual

Vrv series pocket manual
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Si30 - 701_A
Pocket
Manual
Service Diagnosis

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Chris medina
June 4, 2025

How do I put unit out of master mode?

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Summary of Contents for Daikin VRVII

  • Page 1 Si30 - 701_A Pocket Manual Service Diagnosis...

  • Page 2: Table Of Contents

    VRV Series Applicable Models ........... 2 1. Symptom-based Troubleshooting ....12 2. Troubleshooting by Remote Controller ... 18 2.1 The INSPECTION / TEST Button .....18 2.2 Self-diagnosis by Wired Remote Controller ..19 2.3 Self-diagnosis by Wireless Remote Controller ......22 2.4 Error Codes and Description ......24 2.5 Error Codes - Sub Codes ........35 3.
  • Page 3 VRV Series 3.17 CA Thermistor for Discharge Air Abnormality ............86 3.18 CC Humidity Sensor System Abnormality ..88 3.19 CJ Room Temperature Thermistor in Remote Controller Abnormality ......90 3.20 E1 PCB Abnormality .......... 92 3.21 E2 Earth Leakage by Leak Detection PCB Assy ........
  • Page 4 VRV Series 3.46 JA Discharge Pipe Pressure Sensor Abnormality .............185 3.47 JC Low Pressure Sensor Abnormality .....188 3.48 JC Suction Pipe Pressure Sensor Abnormality .............191 3.49 L1 Inverter PCB Abnormality ......194 3.50 L4 Inverter Radiation Fin Temperature Rise Abnormality .............202 3.51 L5 Momentary Overcurrent of Inverter Compressor ........207 3.52 L8 Momentary Overcurrent of...
  • Page 5 VRV Series 3.68 UC Address Duplication of Centralized Remote Controller ....... 335 3.69 UE Transmission Error between Centralized Remote Controller and Indoor Unit ............336 3.70 UF System is not Set yet ......... 341 3.71 UH System Abnormality, Refrigerant System Address Undefined ..343...

  • Page 6: Applicable Models

    VRV Series Applicable Model Series Reference Refrigerant Type Product Series Page VRVII R-22 VRVII-S Air Cooled Inverter VRVII M(A) VRVII-S Water VRV-WII Cooled R-410A VRVIII Air Cooled VRVIII-Q Inverter P(A) VRVIII-S Water VRV-WIII Cooled...
  • Page 7 VRV Series Applicable Models 1. R-22 1-1. VRVII M(A) Series...
  • Page 8 VRV Series 1-2. VRVII-S M Series...
  • Page 9 VRV Series 2. R-410A 2-1. VRVII M(A) Series...
  • Page 10 VRV Series 2-2. VRVII-S M Series...
  • Page 11 VRV Series 2-3. VRV-WII M Series...
  • Page 12 VRV Series 2-4. VRVIII P(A) Series...
  • Page 13 VRV Series...
  • Page 14 VRV Series 2-5. VRVIII-Q P Series Outdoor Units Type Model Name Symbol For Replacement RQYQ...
  • Page 15 VRV Series 2-6. VRVIII-S P Series...
  • Page 16 VRV Series 2-7. VRV-WIII...

  • Page 17: Symptom-Based Troubleshooting

    Symptom-based Troubleshooting 1. Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure 1 The system does not start Blowout of Turn OFF the power operation at all. fuse(s) supply and then replace the fuse(s). Cutout of • If the knob of any breaker(s) breaker is in its OFF position, turn ON the...
  • Page 18 Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure 4 The system The system stops If the OPERATION Normal operation. does not and immediately lamp on the remote The system will operate. restarts operation. controller turns ON, automatically the system will be start operation Pressing the normal.
  • Page 19 Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure 7 The system This symptom The system is in Wait for a period conducts fan occurs preparation mode of approximately operation but immediately after of operation. 10 minutes. not cooling or turning ON the heating power supply.
  • Page 20 Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure 10 A white mist <Indoor unit> Uneven Clean the inside comes out In cooling temperature of the indoor unit. from the operation, the distribution due to system. ambient humidity heavy stain of the is high. inside of the (This indoor unit indoor unit...
  • Page 21 Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure 11 The system <Indoor unit> These are Normal operation. produces Immediately after operating sounds This sound sounds. turning ON the of the electronic becomes low power supply, indoor expansion valve after a lapse of unit produces of the indoor unit.
  • Page 22 Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure 12 Dust comes Dust comes out Dust, which has Normal operation. out from the from the system deposited on the system. when it restarts inside of indoor after the stop for unit, is blown out an extended from the system.

  • Page 23: Troubleshooting By Remote Controller

    Troubleshooting by Remote Controller 2. Troubleshooting by Remote Controller 2.1 The INSPECTION / TEST Button The following modes can be selected by using the [Inspection/Test Operation] button on the remote control. Service data can be obtained. • Error code history •...

  • Page 24: Self-Diagnosis By Wired Remote Controller

    Troubleshooting by Remote Controller 2.2 Self-diagnosis by Wired Remote Controller 2.2.1 Wired Remote Controller — 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 operation to stop.

  • Page 25: Wired Remote Controller

    Troubleshooting by Remote Controller 2.2.2 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 26 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...

  • Page 27: Self-Diagnosis By Wireless Remote Controller

    Troubleshooting by Remote Controller 2.3 Self-diagnosis by Wireless Remote Controller If unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit flashes. The error code can be determined by following the procedure described below. (The error code is displayed when an operation error has occurred.
  • Page 28 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. Press MODE selector When MODE selector button.

  • Page 29: Error Codes And Description

    Troubleshooting by Remote Controller 2.4 Error Codes and Description 2.4.1 Indoor Unit R-22 ∗ For the model names, refer to P.2~11.
  • Page 30 Troubleshooting by Remote Controller ∗ For the model names, refer to P.2~11.
  • Page 31 Troubleshooting by Remote Controller R-410A ∗ For the model names, refer to P.2~11.
  • Page 32 Troubleshooting by Remote Controller ∗ For the model names, refer to P.2~11.
  • Page 33 Troubleshooting by Remote Controller 2.4.2 Outdoor Unit...
  • Page 34 Troubleshooting by Remote Controller...
  • Page 35 Troubleshooting by Remote Controller...
  • Page 36 Troubleshooting by Remote Controller...
  • Page 37 Troubleshooting by Remote Controller...
  • Page 38 Troubleshooting by Remote Controller...
  • Page 39 Troubleshooting by Remote Controller...

  • Page 40: Error Codes - Sub Codes

    Troubleshooting by Remote Controller 2.5 Error Codes - Sub Codes If an error code like the one shown below is displayed when the navigation remote controller (BRC1E61 or 71) is in use, make a detailed diagnosis or a diagnosis of the relevant unit referring to the attached list of detailed error codes.
  • Page 41 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis AH - 03 Transmission error (between Check for the connection of the the self-cleaning decoration harness connector between the panel and the indoor unit) panel PCB and the indoor unit [when the self-cleaning PCB.
  • Page 42 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis C6 - 01 Faulty combination of indoor A combination of indoor unit PCB unit PCB and the PCB for the and the PCB for the fan is faulty. Check whether the capacity setting adaptor is correct and the type of the PCB for the fan is...

  • Page 43: Outdoor Unit

    Troubleshooting by Remote Controller 2.5.2 Outdoor Unit Troubleshooting Error code Description of error Description of diagnosis E3 - 01 High pressure switch Refer to the “E3” flow chart of E3 - 02 activated (Master) each manual and make a diagnosis of the relevant unit E3 - 03 High pressure switch based on the Error code shown...
  • Page 44 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis E7 - 01 Fan motor 1 lock (Master) E7 - 02 Fan motor 2 lock (Master) E7 - 05 Fan motor 1 instantaneous Refer to the following to make a overcurrent (Master) diagnosis of the fan motor of the relevant unit.
  • Page 45 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis F6 - 02 Excess refrigerant charge Excess refrigerant charge was error detected during test run. F6 - 03 Excess refrigerant charge Excess refrigerant charge was warning detected during operation other than test run.
  • Page 46 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis J3 - 01 Faulty discharge pipe Refer to the “J3” flow chart of thermistor 1 (Master: INV. each manual and make a compressor) diagnosis of the relevant compressor of the relevant unit J3 - 02 Faulty discharge pipe...
  • Page 47 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis J6 - 01 Faulty heat exchanger Refer to the “J6” flow chart of thermistor (Master) each manual and make a diagnosis of the relevant J6 - 02 Faulty heat exchanger thermistor based on the Error thermistor (Slave 1)
  • Page 48 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis L1 - 04 IGBT error (Master: Inverter The inverter PCB may be faulty PCB) or a PCB other than the specified one is mounted. Refer to the “L1” flow chart of each manual and make a diagnosis of the relevant unit based on the Error code...
  • Page 49 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis L8 - 03 INV. compressor Refer to the “L8” flow chart of instantaneous overcurrent each manual and make a error (Master) diagnosis of the relevant compressor of the relevant unit L8 - 06 INV.
  • Page 50 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis U1 - 01 Reverse phase/open phase Refer to the “U1” flow chart of for power supply (Master) each manual and make a diagnosis of the relevant unit U1 - 04 Reverse phase for power based on the Error code shown supply [with power supply...

  • Page 51: Troubleshooting By Indication On The Remote Controller

    Troubleshooting by Indication on the Remote Controller 3. Troubleshooting by Indication on the Remote Controller External Protection Device Abnormality Remote Controller Display Applicable Models All indoor models 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/...
  • Page 52 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution External protection device is connected Actuation of to terminals T1 and external T2 of the indoor protection unit terminal device.

  • Page 53: Abnormality

    Troubleshooting by Indication on the Remote Controller PCB Abnormality Remote Controller Display Applicable Models All indoor models 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 54 Troubleshooting by Indication on the Remote Controller Drain Level Control System (S1L) Abnormality Remote Controller Display Applicable Models R-22: FXC, FXF, FXA, FXK, FXH (Option), FXM (Option), FXYB R-410A: FXFQ, FXZQ, FXDQ, FXMQ-P, FXHQ (Option), FXAQ (Option) Method of Error Detection By float switch OFF detection Error Decision Conditions When rise of water level is not a condition and the float...
  • Page 55 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is power supply 220~240V Provide provided? 220~240V power supply. float switch is connected to connector of the indoor unit PCB.
  • Page 56 Troubleshooting by Indication on the Remote Controller drain pump works when the power supply is reset Check the drain for the indoor unit. piping for clogging or upward slope, etc. voltage of terminals Y1 and Y2 or connector is Replace the 220~240 V (within 5 indoor unit PCB.
  • Page 57 Troubleshooting by Indication on the Remote Controller Fan Motor (M1F) Lock, Overload Remote Controller Display Applicable Models R-22: FXA, FXF, FXH R-410A: FXAQ, FXFQ, FXHQ Method of Error Detection Abnormal fan revolutions are detected by a signal output from the fan motor. Error Decision Conditions When the fan revolutions do not increase Supposed Causes...
  • Page 58 Troubleshooting by Indication on the 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. Are there any foreign matters Remove the...
  • Page 59 Troubleshooting by Indication on the Remote Controller Note: ∗1. If any junction connector is provided between the connector on the indoor unit PCB and the fan motor, also check whether or not the junction connector is properly connected. ∗2. All resistance measuring points and judgement criteria.
  • Page 60 Troubleshooting by Indication on the Remote Controller Indoor Unit Fan Motor Abnormality Remote Controller Display Applicable Models FXD(Q) Method of Error Detection This error is detected if there is no revolutions detection signal output from the fan motor. Error Decision Conditions When no revolutions can be detected even at the maximum output voltage to the fan Supposed Causes...
  • Page 61 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is the connector Properly connect securely the connectors. connected? (At this time, check for any defective connector contact or broken...
  • Page 62 Troubleshooting by Indication on the Remote Controller Overload/Overcurrent/Lock of Indoor Unit Fan Motor Remote Controller Display Applicable Models R-22: FXM40~125L R-410A: FXMQ50~140P Method of Error Detection Detection from the current flow on the fan PCB. Detection from the RPM of the fan motor in operation. Detection from the position signal of the fan motor.
  • Page 63 Troubleshooting by Indication on the 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 and wait for 10 minutes. There is a foreign matter Remove the around the fan.
  • Page 64 Troubleshooting by Indication on the Remote Controller resistance between the power wire terminals of the fan motor and Replace the fan motor frame (meal motor. 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 (*1).
  • Page 65 Troubleshooting by Indication on the Remote Controller lamp of the indoor PCB Replace the fan blinks and the HAP PCB. lamp of the fan PCB is OFF. Replace the fan motor. Note: ∗1. Measurement of power wire connector. Remove the connector from the fan PCB and measure the resistance between the U and V, V and W, and W and U phases of the motor connector (with five core wire) and check that each phase are...
  • Page 66 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models R-22: FXM200, 250L R-410A: FXMQ-MA Method of Error Detection This error is detected by detecting that the individual power supply for the fan turns OFF. Error Decision Conditions When it is not detected that the individual power supply for the indoor unit fan turns ON while in operation.
  • Page 67 Troubleshooting by Indication on the 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 cable of the indoor Properly connect unit fan properly the cable.
  • Page 68 Troubleshooting by Indication on the Remote Controller Swing Flap Motor (M1S) Abnormality Remote Controller Display Applicable Models R-22: FXC, FXA, FXF, FXH, FXK R-410A: FXCQ, FXHQ, FXKQ, FXUQ Method of Error Detection Utilizes ON/OFF of the limit switch when the motor turns. Error Decision Conditions When ON/OFF of the micro-switch for positioning cannot be reversed even though the swing flap motor is...
  • Page 69 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Is power supply 220~240V Provide provided? 220~240V power supply. Indoor unit is a model equipped with a swing Replace the flap function...
  • Page 70 Troubleshooting by Indication on the Remote Controller The relay cable has Replace the no continuity. power supply relay cable. When the airflow direction flap- cam mechanism is disconnected from the Replace the swing motor, operation swing motor. is normal when turned ON again.
  • Page 71 Troubleshooting by Indication on the Remote Controller Power Supply Voltage Abnormality Remote Controller Display Applicable Models FXMQ20~140P 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 or less, or 386V or more.
  • Page 72 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the condition of the power supply. Check if power supply voltage is 220-240V ±10%.
  • Page 73 Troubleshooting by Indication on the Remote Controller Electronic Expansion Valve Coil Abnormality / Dust Clogging Remote Controller Display Applicable Models All indoor models Method of Error Detection Check the coil condition of electronic expansion valve by using micro-computer. Check the dust clogging condition of electronic expansion valve main body by using micro-computer.
  • Page 74 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. When power Replace the is supplied. electronic expansion valve main body. Electronic expansion valve is Shut the power connected to indoor supply OFF after...
  • Page 75 Troubleshooting by Indication on the Remote Controller Note: ∗1: How to check the electronic expansion valve coil Remove the connector for electronic expansion valve from PCB. Measure the resistance value between pins and check the continuity to judge the condition. 1) White White (1) 2) Yellow...
  • Page 76 Troubleshooting by Indication on the Remote Controller 3.10 Drain Level above Limit Remote Controller Display Applicable Models R-22: FXF, FXC, FXK, FXS, FXM, FXYB R-410A: FXFQ, FXZQ, FXCQ, FXKQ, FXDQ, FXMQ, FXHQ, FXUQ Method of Error Detection Water leakage is detected based on float switch ON/OFF operation while the compressor is in non-operation.
  • Page 77 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Field drain piping has a defect such as Modify the drain upward sloping. piping.
  • Page 78 Troubleshooting by Indication on the Remote Controller 3.11 Capacity Determination Device Abnormality Remote controller display Applicable Models All indoor models 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 79 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. indoor unit PCB was replaced Replace the with a spare indoor unit PCB. PCB.
  • Page 80 Troubleshooting by Indication on the Remote Controller 3.12 Transmission Error (between Indoor unit PCB and Fan PCB) Remote Controller Display Applicable Models FXMQ20~140P Method of Error Detection Check the condition of transmission between indoor unit PCB and fan PCB using micro-computer. Error Decision Conditions When normal transmission is not carried out for certain duration.
  • Page 81 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. connector between indoor unit PCB and fan PCB Connect the accurately connector connected? (∗1) accurately.
  • Page 82 Troubleshooting by Indication on the Remote Controller Note: ∗1. Pull out and insert the connector once and check it is absolutely connected. ∗2. Method to check transmission part of indoor unit PCB. Turn OFF the power and remove the connector of indoor unit PCB.
  • Page 83 Troubleshooting by Indication on the Remote Controller 3.13 Thermistor for Liquid Pipe Abnormality Remote Controller Display Applicable Models All indoor models Method of Error Detection Error detection is carried out by temperature detected by liquid pipe thermistor. Error Decision Conditions When the liquid pipe thermistor becomes disconnected or shorted while the unit is running Supposed Causes...
  • Page 84 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Remove the thermistor from the indoor unit PCB, and then insert it again. Is the thermistor Normal (The normal?
  • Page 85 Troubleshooting by Indication on the Remote Controller 3.14 Thermistor for Gas Pipe Abnormality Remote Controller Display Applicable Models All indoor models Method of Error Detection Error detection is carried out by temperature detected by gas pipe thermistor. Error Decision Conditions When the gas pipe thermistor becomes disconnected or shorted while the unit is running Supposed Causes...
  • Page 86 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Remove the thermistor from the indoor unit PCB, and then insert it again. Is the thermistor Normal (The normal?
  • Page 87 Troubleshooting by Indication on the Remote Controller 3.15 Combination Abnormality (between Indoor unit PCB and Fan PCB) Remote Controller Display Applicable Models FXMQ20~140P Method of Error Detection Check the condition of transmission with fan PCB using indoor unit PCB. Error Decision Conditions When the communication data of fan PCB is determined as incorrect Supposed Causes...
  • Page 88 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the Replace it with type of fan PCB the correct fan correct? PCB.
  • Page 89 Troubleshooting by Indication on the Remote Controller 3.16 Thermistor for Suction Air Abnormality Remote Controller Display Applicable Models All indoor models Method of Error Detection Error detection is carried out by temperature detected by suction air thermistor. Error Decision Conditions When the suction air thermistor becomes disconnected or shorted while the unit is running Supposed Causes...
  • Page 90 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Remove the thermistor from the indoor unit PCB, and then insert it again. Is the thermistor Normal (The normal?
  • Page 91 Troubleshooting by Indication on the Remote Controller 3.17 Thermistor for Discharge Air Abnormality Remote Controller Display Applicable Models All indoor models Method of Error Detection Error detection is carried out by temperature detected by discharge air temperature thermistor. Error Decision Conditions When the discharge air temperature thermistor becomes disconnected or shorted while the unit is running.
  • Page 92 Troubleshooting by Indication on the Remote Controller 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 the indoor unit PCB. thermistor and turn ON again. Resistance is normal when measured after...
  • Page 93 Troubleshooting by Indication on the Remote Controller 3.18 Humidity Sensor System Abnormality Remote Controller Display Applicable Models FXFQ 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...
  • Page 94 Troubleshooting by Indication on the Remote Controller 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 95 Troubleshooting by Indication on the Remote Controller 3.19 Room Temperature Thermistor in Remote Controller Abnormality Remote Controller Display Applicable Models All indoor models Method of Error Detection Error detection is carried out by temperature detected by room temperature thermistor in remote controller. Error Decision Conditions When the room temperature thermistor in remote controller becomes disconnected or shorted while the...
  • Page 96 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. Clear the error code history. (∗1) (While in inspection mode, press and hold the “ON/OFF” button for a period of 4 seconds or more.) Is "CJ"...
  • Page 97 Troubleshooting by Indication on the Remote Controller 3.20 PCB Abnormality Remote Controller Display Applicable Models All outdoor unit models Method of Error Detection Abnormality is detected under the communication conditions in the hardware section between the indoor unit and outdoor unit. Error Decision Conditions When the communication conditions in the hardware section between the indoor unit and the outdoor unit are...
  • Page 98 Troubleshooting by Indication on the 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 once and turn ON again. External factor Return to normal? other than error (for example, noise etc.).
  • Page 99 Troubleshooting by Indication on the Remote Controller 3.21 Earth Leakage by Leak Detection PCB Assy Remote Controller Display Applicable Models VRV-WII, -WIII, III and III-Q Series Method of Error Detection Failure is to be detected by using leak detection PCB assy.
  • Page 100 Troubleshooting by Indication on the 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 then disconnect compressor lead wire. Check the compressor Insulation fault Replace the for insulation using a...
  • Page 101 Troubleshooting by Indication on the Remote Controller Check whether there is continuity No continuity (∗1) between both connector Replace the ends of the earth earth leakage leakage detection PCB. detection PCB. Continuity Check whether there is No continuity continuity between Replace the high both ends of high pressure switch.
  • Page 102 3.22 Actuation of High Pressure Sensor Remote Controller Display Applicable Models VRVII and II-S Series 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 high pressure switch activation count reaches the number specific to the operation mode.
  • Page 103 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. the high pressure switch connectors connected Connect the to the outdoor connector and main PCB operate again.
  • Page 104 Troubleshooting by Indication on the Remote Controller 3.23 Abnormal Discharge Pressure Remote Controller Display Applicable Models VRV-WII, -WIII, III, III-S and III-Q Series 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 high pressure switch activation count reaches the number specific to the...
  • Page 105 Troubleshooting by Indication on the 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. Is the stop valve open? Is the high pressure switch connector properly connected to the main PCB? Is there continuity with the high pressure switch? Are the 3 points...
  • Page 106 Troubleshooting by Indication on the Remote Controller Check if the “high pressure” value and the actual Replace the measurement value outdoor unit main by pressure PCB. sensor are the same. · The high pressure sensor is normal, and the pressure detected with the PCB is also normal. ·...
  • Page 107 Troubleshooting by Indication on the Remote Controller 3.24 Actuation of Low Pressure Sensor Remote Controller Display Applicable Models VRVII and II-S Series Method of Error Detection Error Decision Conditions Error is generated when the low pressure is dropped under specific pressure. Supposed Causes...
  • Page 108 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is stop valve Open stop valve. opened? pressure at stop Refrigerant due to error is shortage, abnormal.
  • Page 109 Troubleshooting by Indication on the Remote Controller 3.25 Abnormal Suction Pressure Remote Controller Display Applicable Models VRV-WII, -WIII, III, III-S and III-Q Series 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 110 Troubleshooting by Indication on the Remote Controller 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. Mount a pressure gauge on the low pressure service port.
  • Page 111 Troubleshooting by Indication on the 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 112 3.26 Inverter Compressor Motor Lock Remote Controller Display Applicable Models VRVII and II-S Series 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...
  • Page 113 Troubleshooting by Indication on the 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. the UVWN Connect wiring normal? correctly.
  • Page 114 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series 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 115 Troubleshooting by Indication on the 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 Local factor valve open? Open the stop valve. Are the relay wires to the Replace the compressor...
  • Page 116 Troubleshooting by Indication on the Remote Controller Has the compressor started up at high Defective differential pressure pressure (∗1)? equalizing Check the refrigerant system. Remove the connection between the compressor and inverter. Set the power transistor check mode ON using “Setting mode (2)”...
  • Page 117 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRV-WII and -WIII Series Method of Error Detection Pick up the location signal using the inverter PCB from the UVWN line connected between the inverter and the compressor and detect location signal pattern. Error Decision Conditions In normal operation, location signal for a triple cycle of frequency applied, while in locked operation, it is a...
  • Page 118 Troubleshooting by Indication on the Remote Controller 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 opened? valve. Is the UVWN wire Connect connection properly.
  • Page 119 Troubleshooting by Indication on the Remote Controller Inverter output voltage among 3 phases is within ±5V for TL Replace the power supply and inverter PCB. ±10V for YL power supply. Replace the inverter compressor. Note: ∗1. Difference in pressure between high and low pressures before startup ∗2.
  • Page 120 3.27 STD Compressor Motor Overcurrent/Lock Remote Controller Display Applicable Models VRVII, III and III-Q Series Method of Error Detection Detects the overcurrent with current sensor. Error Decision Conditions Error is decided when the detected current value exceeds the below mentioned value for 2 seconds.
  • Page 121 Troubleshooting by Indication on the Remote Controller 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. Obstacle Remove the exists around the air obstacle.
  • Page 122 Troubleshooting by Indication on the Remote Controller 3.28 Outdoor Unit Fan Motor Abnormality Remote Controller Display Applicable Models VRVIII and III-Q Series Method of Error Detection Detect an error based on the current value in the inverter PCB (as for motor 2, current value in the fan PCB). Detect an error for the fan motor circuit based on the number of rotation detected by hole IC during the fan motor operation.
  • Page 123 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check in the monitor mode Check fan motor (fan motor 1 or 2) corresponding to error code “E7”...
  • Page 124 Troubleshooting by Indication on the Remote Controller continuity of Replace the fan fuse on the fan inverter PCB. inverter PCB. 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...
  • Page 125 Troubleshooting by Indication on the Remote Controller CHECK 17 Check fan motor connector (signal wire) signal wire short circuits between Vcc and GND Replace the and between UVW corresponding and GND. fan motor. Put the power supply ON to check the following LED lamps.
  • Page 126 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVIII-S Series Method of Error Detection Detect an error based on the current value in the inverter PCB (as for motor 2, current value in the fan PCB). Detect an error for the fan motor circuit based on the number of rotation detected by hole IC during the fan motor operation.
  • Page 127 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check in the monitor mode 4HP ~ 6HP class models have 2 fans. Check fan motor (fan motor 1 or 2) corresponding to error code “E7”...
  • Page 128 Troubleshooting by Indication on the Remote Controller continuity of fuse on Replace the PCB. main PCB. 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 Replace the terminal of fan motor and...
  • Page 129 Troubleshooting by Indication on the Remote Controller CHECK 17 Check fan motor connector (signal wire) signal wire short circuits between Vcc and Replace the GND and between corresponding UVW and fan motor. GND. Replace the PCB. Refer to P.378. CHECK 16 Refer to P.379.
  • Page 130 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII-S Series 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 14.5 seconds or more when the fan motor...
  • Page 131 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Connector of Connect the fan motor is connector. disconnected. Is there any obstacle Remove the around the fan? obstacle.
  • Page 132 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII Series 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...
  • Page 133 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Connector of fan motor is Connect the disconnected. connector. Harness connector between compressor inverter Connect the PCB and fan inverter harness...
  • Page 134 Troubleshooting by Indication on the Remote Controller Is the LED (HAP) Replace the fan on fan inverter PCB inverter PCB. blinking? CHECK 16 Check on connector of fan motor (Power supply cable) Are the resistance values between phases of U, V, W balanced? Is there any Replace the fan short circuiting...
  • Page 135 Troubleshooting by Indication on the Remote Controller 3.29 Electronic Expansion Valve Coil Abnormality Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series Method of Error Detection Check disconnection of connector To be detected based on continuity existence of electronic expansion valve coil Error Decision Conditions No current is detected in the common (COM [+]) when power supply is ON.
  • Page 136 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Turn power supply OFF, and turn power supply ON again. Return to External factor normal? other than error (for example,...
  • Page 137 Troubleshooting by Indication on the 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 Judgement criteria (Yellow) 3 1 - 6 2 - 6 40~50Ω...
  • Page 138 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII, -WII, -WIII and II-S Series 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 139 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Turn power supply OFF, and turn power supply ON again. Return to External factor normal? other than error (for example,...
  • Page 140 Troubleshooting by Indication on the Remote Controller (Normal) Pin No. 1. White 2. Yellow 3. Orange 4. Blue 5. Red 6. Brown 1. White × × × Approx. Approx. 300 Ω 150 Ω 2. Yellow × × Approx. Approx. 300 Ω 150 Ω...
  • Page 141 Troubleshooting by Indication on the Remote Controller 3.30 Abnormal Discharge Pipe Temperature Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series Method of Error Detection Abnormality 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 142 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Connect the service checker. Press reset and start operation again. Check if discharge pipe thermistor Replace the property is normal.
  • Page 143 Troubleshooting by Indication on the Remote Controller Note: ∗1. Compare the resistance value of discharge pipe thermistor and the value based on the surface thermometer. Refer to P.351. CHECK 3 Refer to P.369. CHECK 11...
  • Page 144 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRV-WII and -WIII Series Method of Error Detection Abnormality 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 145 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Connect the Service Checker. Restart operation after resetting operation. discharge pipe thermistor Replace the characteristics discharge pipe normal?
  • Page 146 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII and II-S Series Method of Error Detection Abnormality is detected according to the temperature detected by the discharge pipe thermistor. Error Decision Conditions When the discharge pipe temperature rises to an...
  • Page 147 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Discharge pipe Refrigerant temperature is 115˚C shortage, or higher. compression defect, etc. Defective refrigerant system.
  • Page 148 Troubleshooting by Indication on the Remote Controller 3.31 Refrigerant Overcharged Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series 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 149 Troubleshooting by Indication on the Remote Controller 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 150 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRV-WII and -WIII Series Method of Error Detection Detect excessive charging of refrigerant using suction pipe temperature and subcooling heat exchanger outlet temperature during check operation. Error Decision Conditions When the suction pipe temperature and the subcooling heat exchanger outlet temperature during check operation drop and become below the evaporation...
  • Page 151 Troubleshooting by Indication on the Remote Controller 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 suction pipe thermistor and the subcooling heat exchanger outlet thermistor temperature sensor mounted to...
  • Page 152 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII Series Method of Error Detection Refrigerant overcharge is detected from suction pipe and subcooling heat exchanger gas pipe temperature during check operation. Error Decision Conditions When the suction pipe and subcooling heat exchanger gas pipe temperature is lower than evaporating temperature during check operation.
  • Page 153 Troubleshooting by Indication on the Remote Controller 3.32 High Pressure Switch System Abnormality Remote Controller Display Applicable Models VRVIII-Q 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 the compressor stops operating.
  • Page 154 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the protection HPS connector correctly Connect it connected to the correctly. outdoor unit PCB? Wait for 10 minutes after unit stops, then check the...
  • Page 155 Troubleshooting by Indication on the Remote Controller 3.33 Outdoor Unit Fan Motor Signal Abnormality Remote Controller Display Applicable Models VRVIII and III-Q Series 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 156 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the fan motor corresponding to the error code “H7” in the monitor mode. When check 3 shows as follows: →...
  • Page 157 Troubleshooting by Indication on the Remote Controller Check the connector of the fan motor (∗1). Check if the resistance of the fan motor lead wire Replace the fan between Vcc and UVW motor. and between GND and UVW are balanced. Replace the inverter PCB.
  • Page 158 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII Series 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. Supposed Causes...
  • Page 159 Troubleshooting by Indication on the 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.
  • Page 160 Troubleshooting by Indication on the Remote Controller 3.34 Outdoor Air Thermistor Abnormality Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series Method of Error Detection Error is detected from the temperature detected by the outdoor air thermistor. Error Decision Conditions When the outdoor air thermistor has short circuit or open circuit.
  • Page 161 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Confirm which thermistor is abnormal using outdoor unit "monitor mode". Connector is Connect the connected to outdoor connector and unit PCB.
  • Page 162 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII and II-S Series Method of Error Detection The abnormal detection is based on current detected by current sensor. Error Decision Conditions When the outdoor air temperature sensor has short circuit or open circuit.
  • Page 163 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Connector is connected to outdoor Connect the unit PCB. connector and turn ON again. Resistance is normal when measured after...
  • Page 164 Troubleshooting by Indication on the Remote Controller 3.35 Water System Error Remote Controller Display Applicable Models VRV-WII and -WIII Series Method of Error Detection Detect abnormalities using the thermistor on the side of the heat exchanger gas. Detect turned OFF interlock circuit. (When interlock setting is provided.) Error Decision Conditions When temperature on the heat exchanger gas side...
  • Page 165 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Clogged water piping system (mixing in of Remove the clog. foreign particles, solenoid valve for water use) Is the...
  • Page 166 Troubleshooting by Indication on the Remote Controller characteristics of the thermistor on the heat exchanger gas Replace the side and the low thermistor/sensor pressure sensor if any of its normal? characteristics (∗1) are abnormal. Disconnect the connection between the compressor and the inverter and turn ON the power transistor check mode setting using...
  • Page 167 Troubleshooting by Indication on the Remote Controller 3.36 High Pressure Sensor Abnormality Remote Controller Display Applicable Models VRVIII-Q Series Method of Error Detection Error is detected from the pressure measured with high pressure sensor. Error Decision Conditions When the high pressure sensor is short-circuit or open circuit.
  • Page 168 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution 1. Set the high pressure gauge. 2. Connect the checker for VRV. Are the characteristics of the high pressure sensor...
  • Page 169 Troubleshooting by Indication on the Remote Controller Are the characteristics of Replace the high the high pressure pressure sensor. sensor normal? Replace the outdoor unit sub PCB.
  • Page 170 Troubleshooting by Indication on the Remote Controller 3.37 Current Sensor Abnormality Remote Controller Display Applicable Models VRVIII and III-Q Series Method of Error Detection Error is detected according to the current value detected by current sensor. Error Decision Conditions When the current value detected by current sensor becomes 5A or lower, or 40A or more during standard compressor operation.
  • Page 171 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the current sensor corresponding to the error code “J2” in the monitor mode. Check 4 shows as follows: →...

  • Page 172: Compressor Operation

    Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII Series Method of Error Detection Error is detected according to the current value detected by current sensor. Error Decision Conditions When the current value detected by current sensor becomes 5A or lower, or 40A or more during standard compressor operation.
  • Page 173 Troubleshooting by Indication on the Remote Controller 3.38 Discharge Pipe Thermistor Abnormality Remote Controller Display Applicable Models All outdoor unit series Method of Error Detection Error is detected from the temperature detected by discharge pipe thermistor. Error Decision Conditions When a short circuit or an open circuit in the discharge pipe thermistor is detected.
  • Page 174 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Confirm which discharge pipe thermistor is abnormal using outdoor unit "monitor mode". Connector is connected to Connect the outdoor unit PCB.
  • Page 175 Troubleshooting by Indication on the Remote Controller 3.39 Heat Exchanger Gas Pipe Thermistor Abnormality Remote Controller Display Applicable Models VRV-WII and -WIII Series Method of Error Detection Error is detected according to the temperature detected by heat exchanger gas pipe thermistor. Error Decision Conditions When the heat exchanger gas pipe thermistor is short circuited or open.
  • Page 176 Troubleshooting by Indication on the 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 for heat exchanger gas pipe Connect the thermistor connected connector and to outside unit operate unit PCB?
  • Page 177 Troubleshooting by Indication on the Remote Controller 3.40 Suction Pipe Thermistor Abnormality Remote Controller Display Applicable Models All outdoor unit models Method of Error Detection 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 178 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Connector is connected to outdoor Connect the unit PCB. connector and turn ON again. Resistance is normal when measured after...
  • Page 179 Outdoor Unit Heat Exchanger Thermistor Abnormality Remote Controller Display Applicable Models VRVII, II-S, III, III-S and III-Q Series Method of Error Detection Error is detected from the temperature detected by the outdoor unit heat exchanger thermistor. Error Decision Conditions When a short circuit or an open circuit in the heat exchanger thermistor is detected.
  • Page 180 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Confirm which thermistor is abnormal using outdoor unit "monitor mode". Connector is connected to outdoor Connect the unit PCB.
  • Page 181 3.42 Liquid Pipe Thermistor Abnormality Remote Controller Display Applicable Models VRVII, -WII, III, -WIII, III-S and III-Q Series Method of Error Detection 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.
  • Page 182 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Confirm which thermistor is abnormal using outdoor unit "monitor mode". Is the connector for liquid pipe Connect the thermistor connected to...
  • Page 183 Troubleshooting by Indication on the Remote Controller 3.43 Thermistor System Abnormality Remote Controller Display Applicable Models VRVIII-Q Series Method of Error Detection Error is detected according to the temperature detected by each individual thermistor. Error Decision Conditions When thermistor is disconnected or short-circuited during operation Supposed Causes Defective thermistor...
  • Page 184 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check connectors for connection. Normal? Connect correctly. Remove thermistor from outdoor unit PCB, then measure the resistance using a tester.
  • Page 185 Troubleshooting by Indication on the Remote Controller 3.44 Subcooling Heat Exchanger Gas Pipe Thermistor Abnormality Remote Controller Display Applicable Models All outdoor unit series Method of Error Detection 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 186 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Confirm which thermistor is abnormal using outdoor unit "monitor mode". Is the connector for subcooling heat exchanger gas pipe Connect the...
  • Page 187 Troubleshooting by Indication on the Remote Controller 3.45 High Pressure Sensor Abnormality Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series Method of Error Detection 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.
  • Page 188 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Confirm which high pressure sensor is abnormal using outdoor unit "monitor mode". 1.Set the high pressure gauge upright.
  • Page 189 Troubleshooting by Indication on the Remote Controller Reset the operation, and then restart the outdoor unit. Are the characteristics of Replace the high the high pressure pressure sensor. sensor normal? Replace the outdoor unit main PCB. Note: ∗1. Voltage measurement point Connector for Outdoor unit PCB high pressure...
  • Page 190 3.46 Discharge Pipe Pressure Sensor Abnormality Remote Controller Display Applicable Models VRVII, II-S, -WII and -WIII Series Method of Error Detection Error is detected from the pressure detected by the high pressure sensor. Error Decision Conditions When the discharge pipe pressure sensor is short circuit or open circuit.
  • Page 191 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution high pressure sensor is connected Connect the high to outdoor (outside) pressure sensor and turn ON unit PCB.
  • Page 192 Troubleshooting by Indication on the Remote Controller ∗1: Voltage measurement point Outdoor (outside) Connector for high pressure unit PCB sensor Black Micro-computer White A/D input Measure DC voltage here. CHECK 12 Refer to P.372. CHECK 12...
  • Page 193 Troubleshooting by Indication on the Remote Controller 3.47 Low Pressure Sensor Abnormality Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series Method of Error Detection Error is detected from pressure detected by the low pressure sensor. Error Decision Conditions When the low pressure sensor is short circuit or open circuit.
  • Page 194 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Confirm which low pressure sensor is abnormal using outdoor unit "monitor mode". 1.Set the low pressure gauge upright.
  • Page 195 Troubleshooting by Indication on the Remote Controller Reset the operation, and then restart the outdoor unit. Are the characteristics of Replace the low the low pressure pressure sensor. sensor normal? Replace the outdoor unit main PCB. Note: ∗1. Voltage measurement point Connector for Outdoor unit PCB low pressure...
  • Page 196 3.48 Suction Pipe Pressure Sensor Abnormality Remote Controller Display Applicable Models VRVII, II-S, -WII and -WIII Series Method of Error Detection 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 197 Troubleshooting by Indication on the 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 outdoor pressure sensor (outside) unit property and PCB.
  • Page 198 Troubleshooting by Indication on the Remote Controller Note: ∗1: Voltage measurement point Outdoor (outside) Connector for unit PCB low pressure sensor Black Micro-computer White A/D input CHECK 12 Measure voltage here. Refer to P.372. CHECK 12...
  • Page 199 Troubleshooting by Indication on the Remote Controller 3.49 Inverter PCB Abnormality Remote Controller Display Applicable Models VRVIII Series Method of Error Detection Error is detected based on the current value during waveform output before starting compressor. Error is detected based on the value from current sensor during synchronous operation when starting the unit.
  • Page 200 Troubleshooting by Indication on the 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 check the compressor lead wires. the lead wires have any disconnection, broken...
  • Page 201 Troubleshooting by Indication on the Remote Controller CHECK 4 Check if the power transistor is normal. Check if insulation resistance of the Replace the compressor is compressor and 100kΩ or compressor more. inverter PCB at the same time. Replace the CHECK 4 inverter PCB.
  • Page 202 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVIII-S Series Method of Error Detection Error is detected based on the current value during waveform output before starting compressor. Error is detected based on the value from current sensor during synchronous operation when starting the unit.
  • Page 203 Troubleshooting by Indication on the 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 check the compressor lead wires. the lead wires have any disconnection, broken...
  • Page 204 Troubleshooting by Indication on the Remote Controller CHECK 4 Check if the power Replace the transistor of the fan outdoor unit main driver is PCB. normal. Replace the outdoor unit main PCB. Refer to P.354. CHECK 4...
  • Page 205 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVIII-Q Series 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. Error Decision Conditions When overcurrent is detected at the time of waveform output before operating the compressor...
  • Page 206 Troubleshooting by Indication on the 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 turn ON again. Does the power It is supposed supply normally that the error...
  • Page 207 Troubleshooting by Indication on the Remote Controller 3.50 Inverter Radiation Fin Temperature Rise Abnormality Remote Controller Display Applicable Models VRVIII Series 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 82°C or more.
  • Page 208 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution radiation fin of the inverter PCB concerned Defective exceeded a radiation fin from temperature the power unit of 82˚C.
  • Page 209 Troubleshooting by Indication on the Remote Controller Continue operation. It is supposed that the radiation fin temperature became high due to some field factors. In this connection, check the following points: • Stained radiation fin • Airflow obstructed with dirt or foreign matters •...
  • Page 210 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII, -WII, II-S, -WIII, III-S and III-Q Series 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 96°C or more.
  • Page 211 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Temperature of the radiation fin Defective power rises. Actuates at unit radiation. min. 96 ˚C •...
  • Page 212 Troubleshooting by Indication on the Remote Controller 3.51 Momentary Overcurrent of Inverter Compressor Remote Controller Display Applicable Models VRVIII Series Method of Error Detection 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 213 Troubleshooting by Indication on the Remote Controller Troubleshooting Compressor inspection 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. Check if the compressor Replace the lead wires are compressor lead...
  • Page 214 Troubleshooting by Indication on the Remote Controller Failure occurs again after Continue the restarting the operation. unit. Momentary power failure is possible. Replace the inverter compressor. Refer to P.354. CHECK 4...
  • Page 215 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII, -WII, II-S, -WIII, III-S and III-Q Series Method of Error Detection Error is detected from current flowing in the power transistor. Error Decision Conditions When an excessive current flows in the power transistor.
  • Page 216 Troubleshooting by Indication on the Remote Controller Troubleshooting Compressor inspection Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. compressor's coil Replace the is disconnected or the compressor. insulation is defective.
  • Page 217 Troubleshooting by Indication on the Remote Controller There is instantaneous Correct the power drop. power supply. Compressor inspection Inspect according to the diagnosis procedure for odd noises, vibration and operating status of the compressor. Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
  • Page 218 Troubleshooting by Indication on the Remote Controller 3.52 Momentary Overcurrent of Inverter Compressor Remote Controller Display Applicable Models VRVIII Series Method of Error Detection 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 219 Troubleshooting by Indication on the Remote Controller Troubleshooting Output current check 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. Check if the Replace the compressor lead wires compressor lead...
  • Page 220 Troubleshooting by Indication on the 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 221 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII, -WII, II-S, -WIII, III-S and III-Q Series Method of Error Detection Error is detected by current flowing in the power transistor. Error Decision Conditions When overload in the compressor is detected.
  • Page 222 Troubleshooting by Indication on the Remote Controller Troubleshooting Output current check Be sure to turn off the power switch before connecting or disconnecting connectors, or parts Caution may be damaged. secondary current of the inverter is higher than 16.5A (Y1, YL Compressor power supply) and overload...
  • Page 223 Troubleshooting by Indication on the Remote Controller Inverter output voltage check Inverter output voltage is not balanced. (Normal if within ±10V for Y1, YL Replace the power supply and ±5V inverter PCB. for TL power supply) Must be measured when frequency is stable.
  • Page 224 Troubleshooting by Indication on the Remote Controller 3.53 Inverter Compressor Startup Failure Remote Controller Display Applicable Models VRVIII Series Method of Error Detection Detect the failure based on the signal waveform of the compressor. Error Decision Conditions Starting the compressor does not complete. Supposed Causes Stop valve is not opened.
  • Page 225 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check if it is the first time to start after installation. Check if a right Charge a right amount of refrigerant amount of...
  • Page 226 Troubleshooting by Indication on the Remote Controller Check if the compressor lead Fix the wires are compressor lead disconnected. wire. Correct the wiring then supply power to restart.
  • Page 227 Troubleshooting by Indication on the Remote Controller Refrigerant is melting in refrigerant oil. (The Cancel the unit is out of power melting state of supply for more refrigerant. than 6 hours.) Check if the insulation resistance of the Replace the compressor is inverter 100kΩ...
  • Page 228 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII, -WII, II-S, -WIII, III-S and III-Q Series Method of Error Detection Error is detected from current flowing in the power transistor. Error Decision Conditions When overload in the compressor is detected during...
  • Page 229 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution difference between high and low pressure when Unsatisfactory starting is above pressure 0.2MPa or equalization more.
  • Page 230 Troubleshooting by Indication on the Remote Controller After turning ON Reset and again, "L9" blinks restart. again. Compressor inspection Inspect according to the diagnosis procedure for odd noises, vibration and operating status of the compressor. Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
  • Page 231 Troubleshooting by Indication on the Remote Controller 3.54 Transmission Error between Inverter and Control Remote Controller Display Applicable Models VRVIII and III-Q Series 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 or longer.
  • Page 232 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Are the connectors of the inverter PCB, Properly connect control PCB, and sub the connectors.
  • Page 233 Troubleshooting by Indication on the Remote Controller micro- computer normal Replace the monitor (green) of the inverter PCB. inverter PCB is ∗ If the spare blinking. PCB has significant damage, the compressor is probably get defective. In this case, carry out inspections on the compressor...
  • Page 234 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII-S, III-S, -WII and -WIII Series 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 235 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Are the connectors between the main Connect PCB, and inverter transmission PCB connected wiring and turn securely? ON again.
  • Page 236 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII 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 237 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Are the connectors between the outdoor unit main Connect PCB, fan drive PCB and transmission inverter PCB wiring and turn...
  • Page 238 Troubleshooting by Indication on the Remote Controller voltage between red and white of Replace the connector on the inverter PCB. inverter unit is 220 ~ 240 V. When the LC error occur again, replace the control PCB. Check the noise filter for disconnection, and check the...
  • Page 239 Troubleshooting by Indication on the Remote Controller 3.55 Inverter Over-Ripple Protection Remote Controller Display Applicable Models VRVIII, -WIII, III-S and III-Q Series 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 240 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is an imbalance in supply voltages in excess of 14V for 460V units or 6V for 230V units? (See ∗1) Open phase?
  • Page 241 "power supply imbalance" to improve the imbalance. for which DAIKIN is not responsible. Note: ∗1. Measure voltage at the power supply terminal block. ∗2. Measure voltage at terminals RED, WHITE and BLACK wire of the diode module inside the inverter while the compressor is running.
  • Page 242 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII and -WII Series Method of Error Detection Imbalance in supply voltage is detected in PCB. Error Decision Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited status.
  • Page 243 Give the user a copy of "notification of inspection Be sure to explain to the user that results" and leave it up to him there is a "power supply imbalance" to improve the imbalance. for which DAIKIN is not responsible.
  • Page 244 Troubleshooting by Indication on the Remote Controller 3.56 Inverter Radiation Fin Thermistor Abnormality Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series 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 circuited or short circuited status...
  • Page 245 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Measure resistance value of the radiation fin thermistor. CHECK 11 ∗ Disconnect the connector from the radiation fin thermistor, and then check the thermistor.
  • Page 246 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII, II-S, -WII and -WIII Series 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 247 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Measure the resistance of radiation fin thermistor. CHECK 11 Is the resistance of Replace the thermistor inverter PCB.

  • Page 248: Replacing Main Pcb Or Combination Of Pcb Abnormality

    Troubleshooting by Indication on the Remote Controller 3.57 Field Setting Abnormality after Replacing Main PCB or Combination of PCB Abnormality Remote Controller Display Applicable Models VRVIII Series Method of Error Detection This error is detected according to communications with the inverter PCB. Error Decision Conditions Make judgement according to communication data on whether or not the type of the inverter PCB is correct.
  • Page 249 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution the PCB replaced with a spare PCB? Is the model setting of the spare Make correct PCB correct? setting of DIP...
  • Page 250 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVIII-Q Series Method of Error Detection This error is detected according to communications with the INV. PCB. Error Decision Conditions Make judgement according to communication data on whether or not the type of the INV. PCB is correct. Supposed Causes Mismatching of type of PCB Defective (or no) field setting after replacing main PCB...
  • Page 251 Troubleshooting by Indication on the 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 of the Replace it with compressor inverter the correct PCB correct? compressor inverter PCB.
  • Page 252 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII Series Method of Error Detection The defective (or no) field setting after replacing main PCB or defective PCB combination is detected through communications with the inverter. Error Decision Conditions Whether or not the field setting or the type of the PCB is correct through the communication date is judged.
  • Page 253 Troubleshooting by Indication on the 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 PCB, were field setting Correct the field properly settings.
  • Page 254 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII-S Series Method of Error Detection Check the communication state between inverter PCB and control PCB by micro-computer. Error Decision Conditions When the communication data about inverter PCB type is incorrect.
  • Page 255 Troubleshooting by Indication on the Remote Controller 3.58 Refrigerant Shortage Alert Remote Controller Display Applicable Models VRVIII, III-S and III-Q Series Method of Error Detection Detect refrigerant shortage based on the temperature difference between low pressure or suction pipe and heat exchanger.
  • Page 256 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution In cooling mode Set up a pressure gauge at the service port on the low pressure side.
  • Page 257 Troubleshooting by Indication on the Remote Controller Note: ∗1. Check the low pressure value by using pressure gauge in operation. ∗2. Compare the actual measurement value by pressure sensor with the value by the pressure gauge. (To gain actual measurement value by pressure sensor, measure the voltage at the connector [between (2)-(3)] and then convert the value into pressure...
  • Page 258 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRV-WII and -WIII Series Method of Error Detection Detect refrigerant shortage using low pressure or difference in temperature between the suction pipe and the heat exchanger. Error Decision Conditions In cooling Low pressure of 0.25 MPa or less continues for 30 minutes...
  • Page 259 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution In cooling Set up a pressure gauge in the service port on the low pressure side.
  • Page 260 Troubleshooting by Indication on the Remote Controller In heating Connect the Service Checker. After resetting operation with a remote controller, restart operation. characteristics of the suction pipe Replace the thermistor and the heat thermistor. exchanger thermistor normal? (∗3) Is PCB detection Replace the main temperature normal?
  • Page 261 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII and II-S Series Method of Error Detection Shortage of refrigerant is detected by discharge pipe thermistor. Error Decision Conditions Micro-computer judge and detect if the system is refrigerant shortage.
  • Page 262 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Cooling pressure is 0.1 MPa Shortage of or less. refrigerant, closing of stop valve or refrigerant system is...
  • Page 263 Troubleshooting by Indication on the Remote Controller Resistance is normal when measured with the suction pipe thermistor and heat exchanger Replace the thermistor disconnected thermistor. from the outdoor unit PCB. CHECK 11 Replace the outdoor unit PCB. Refer to P.369. CHECK 11 Refer to P.372.
  • Page 264 Reverse Phase, Open Phase Remote Controller Display Applicable Models VRVII, III, -WII, -WIII and III-Q Series Method of Error Detection The phase of each phase are detected by reverse phase detection circuit and right phase or reverse phase are judged.
  • Page 265 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution There is an open phase at the power supply Rectify the open terminal of the phase.
  • Page 266 Troubleshooting by Indication on the Remote Controller 3.60 Power Supply Insufficient or Instantaneous Error Remote Controller Display Applicable Models VRVIII Series 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...
  • Page 267 Troubleshooting by Indication on the 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 between Onsite causes. phases: 460V ± 10% Make proper wire or 208/230V connections...
  • Page 268 Troubleshooting by Indication on the Remote Controller Disconnect the cable from the fan, and then check Power OFF the fan motor for the insulation resistance. insulation resistance is low (i.e., Replace the fan not more than motor. 1MΩ.) Replace the fan driver.
  • Page 269 Troubleshooting by Indication on the Remote Controller Check the fan driver power transistor. Power OFF Has the power transistor got Replace the fan defective? driver PCB. ∗ Observe the conditions of the PCB. <P(A)Y1, PAYL> Check for connector connections: Remove and insert the connectors shown below.
  • Page 270 Troubleshooting by Indication on the Remote Controller Turn ON the power supply. Stop (standby) before the Recheck for the fan rotates. power supply. If there is no problem with the power supply, replace the noise filter PCB. If the error recurs, replace Stop Power ON...
  • Page 271 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVIII-Q Series Method of Error Detection Detection of voltage of main circuit capacitor built in the inverter PCB and power supply voltage. Error Decision Conditions When the voltage aforementioned is not less than 190V. Supposed Causes Power supply insufficient Instantaneous power failure...
  • Page 272 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the condition of the power supply. Check if power supply voltage is 380 to 415V. Check if there is open phase or wrong wiring.
  • Page 273 Troubleshooting by Indication on the Remote Controller Remove and insert the connectors. Has the inverter PCB caused Replace the damage? inverter PCB. ∗ If the inverter PCB is badly damaged, compressor Turn ON the power and fan motor supply, and start are likely to operation.
  • Page 274 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRV-WIII Series Method of Error Detection Detection of voltage of main circuit capacitor built in the inverter and power supply voltage. Error Decision Conditions When the capacitor above only has a voltage of 360 V or less (YL) and 210V or less (TL).
  • Page 275 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution connection wire connected Repair wiring. between the connector? Turn ON again. Turn the magnetic contact switch ON.
  • Page 276 Troubleshooting by Indication on the Remote Controller 220 ~ 240 V of power reaching Replace the the magnetic contact magnetic contact switch coil? switch. Does the voltage between terminals P2 (or P3) and N3 gradually rise to Replace the 556 VDC (Y1, YL) or inverter PCB.
  • Page 277 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVIII-S Series 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 278 Troubleshooting by Indication on the 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 between Onsite causes. phases: 380 to 415V Make proper wire Phase voltage: connections...
  • Page 279 Troubleshooting by Indication on the Remote Controller Check the inverter power transistor. Power OFF Has the power transistor got Replace the faulty? outdoor unit main PCB. ∗ Observe the conditions of the PCB. In the case of a serious failure, a compressor failure may cause the...
  • Page 280 Troubleshooting by Indication on the Remote Controller Has the main Replace the Power OFF PCB caused outdoor unit main damage? PCB. ∗If the PCB replaced is badly damaged, the compressor is likely to get defective. To make sure, recheck the compressor.
  • Page 281 Troubleshooting by Indication on the Remote Controller Stop (standby) Recheck for the when the compressor power supply. If starts up. there is no problem with the Power ON power supply, replace the main PCB. ∗If the PCB replaced is badly damaged, compressor is likely to get defective.
  • Page 282 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII and -WII Series Method of Error Detection Detection of voltage of main circuit capacitor built in the inverter and power supply voltage. Error Decision Conditions When the capacitor above only has a voltage of 360 V or less (YL) and 210V or less (TL).
  • Page 283 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution connection wire connected Repair the wiring. between the connector? Turn ON again. Turn the magnetic contact switch ON.
  • Page 284 Troubleshooting by Indication on the Remote Controller Is 220 ~ 240 V of power reaching the Replace the magnetic contact magnetic contact switch coil? switch. Does the voltage between terminals P2 (or P3) and N3 gradually rise to Replace the 556 VDC (YL) or 283 inverter PCB.
  • Page 285 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII-S Series Method of Error Detection Detection of voltage of main circuit capacitor built in the inverter and power supply voltage. Error Decision Conditions Supposed Causes Power supply insufficient...
  • Page 286 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution connection wire connected Repair the wiring. between the connector? Turn ON again. Does the voltage between terminals Replace the...
  • Page 287 Troubleshooting by Indication on the Remote Controller 200V at the connector of outdoor Monitor field unit PCB side? power supply. Check the transmission wiring between the outdoor unit PCB and inverter unit.
  • Page 288 Troubleshooting by Indication on the Remote Controller 3.61 Check Operation is not Executed Remote Controller Display Applicable Models All outdoor unit series Method of Error Detection Check operation is executed or not executed. Error Decision Conditions Error is decided when the unit starts operation without check operation.
  • Page 289 Troubleshooting by Indication on the 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 performed Press and hold on outdoor unit BS4 on the PCB? outdoor unit main PCB for 5...
  • Page 290 Troubleshooting by Indication on the Remote Controller 3.62 Transmission Error between Indoor Units and Outdoor Units Remote Controller Display Applicable Models All indoor models VRVIII Series 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...
  • Page 291 Troubleshooting by Indication on the Remote Controller 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...
  • Page 292 Troubleshooting by Indication on the Remote Controller fuse on the Replace the fuse. outdoor unit's PCB is burnt. Replace the outdoor unit PCB.
  • Page 293 Troubleshooting by Indication on the Remote Controller Operation ready lamp (H2P) is blinking. Lamp does not go Press and hold OFF for 12 minutes or the RESET more. button on the outdoor unit PCB for 5 seconds. indoor - outdoor and outdoor - outdoor unit Fix the indoor - transmission wiring...
  • Page 294 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models All indoor models VRVIII-S and III-Q Series Method of Error Detection The error is generated when the micro-computer detects that the transmission between the indoor and outdoor unit is not normal. Error Decision Conditions When transmission is not carried out normally for a certain amount of time...
  • Page 295 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the detailed error status in the monitor mode. Confirmation Go on to P.282. of error 4, LED LED lamp lamp indicates as...
  • Page 296 Troubleshooting by Indication on the Remote Controller Reset the power supply. Does the normal condition monitor for the micro-computer (HAP) on the outdoor unit PCB blink? Is the voltage between R, S terminals on the Correct the outdoor unit PCB voltage (400V).
  • Page 297 Troubleshooting by Indication on the Remote Controller Check if the operation is normal with 1 circuit Replace the after outdoor-outdoor outdoor unit main connecting wires are PCB. disconnected. Install DIII-Net expander adaptor.
  • Page 298 Troubleshooting by Indication on the Remote Controller Continued from the previous page In Confirmation of error 4, LED lamp indicates as follows: Start operation of all the indoor units. Do all Continue the the units indicate operation. “U9”? more than 2 minutes pass since Make a diagnosis “U9”...
  • Page 299 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models All indoor models VRVII, II-S, -WII and -WIII Series Method of Error Detection Micro-computer checks if transmission between indoor and outdoor (outside) units is normal. Error Decision Conditions...
  • Page 300 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Has the indoor or outdoor (outside) unit PCB been replaced, or has the indoor - outdoor Press and hold (outside) or outdoor the RESET...
  • Page 301 Troubleshooting by Indication on the Remote Controller Outdoor (outside) unit PCB micro- computer monitor (HAP) blinks. voltage between terminals L1 and N of Supply 220~240 V. the outdoor (outside) unit PCB is 220~240 V. fuse on the outdoor (outside) unit's Replace the fuse.
  • Page 302 Troubleshooting by Indication on the Remote Controller Is indoor - outdoor (outside) unit and outdoor (outside) unit - outdoor Fix the indoor - (outside) unit outdoor (outside) transmission wiring unit transmission normal? wiring. Replace the outdoor (outside) unit PCB.

  • Page 303: And Indoor Unit

    Troubleshooting by Indication on the Remote Controller 3.63 Transmission Error between Remote Controller and Indoor Unit Remote Controller Display Applicable Models All indoor models Method of Error Detection In case of controlling with 2-remote controller, check the system using micro-computer is signal transmission between indoor unit and remote controller (main and sub) is normal.
  • Page 304 Troubleshooting by Indication on the Remote Controller 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 305 Troubleshooting by Indication on the Remote Controller 3.64 Transmission Error (Across Outdoor Units) Remote Controller Display Applicable Models VRVIII and III-Q Series Method of Error Detection Micro-computer checks if transmission between outdoor units is normal. 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 306 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the LED lamps for “Check 3” corresponding to the error code “ U7 ” and for Check 4 in the monitor mode.
  • Page 307 Troubleshooting by Indication on the Remote Controller Check 3 Check 4 Go on to the Diagnosis Flow 7 (Connection of 4 or more outdoor units to the same Check 3 circuit) Check 4 Go on to the Diagnosis Flow 8 (Defective auto address of the slave...
  • Page 308 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 1 Check of error 3 Check of error 4 Check if any disconnection or connection error is Correct the...
  • Page 309 Troubleshooting by Indication on the Remote Controller Check if the normal condition monitor LED for the external control adaptor for outdoor unit blinks. Check if the power supply wire for the external control Connect the adaptor for outdoor power supply unit is connected wire for the to 5V supply...
  • Page 310 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 2 Check of error 3 Check of error 4 Cool/Heat C/H SELECT of selection is unified.
  • Page 311 Troubleshooting by Indication on the Remote Controller Check if the normal condition monitor LED for the external control adaptor for outdoor unit blinks. Check if the power supply wire for the external control adaptor Connect the for outdoor unit is power supply connected to 5V wire for the...
  • Page 312 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 3 Check of error 4 Check of error 3 Check the connection status of connecting wires...
  • Page 313 Troubleshooting by Indication on the Remote Controller Diagnosis Flow 4 Check of error 3 Check of error 4 Check the connection status of connecting wires of the outdoor multi to Replace the SLAVE 2. Check if the outdoor unit main wiring is disconnected PCB of the or is about to be...
  • Page 314 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 6 Check of error 3 Check of error 4 Check connection status of one of the connecting wires of outdoor multi.
  • Page 315 Troubleshooting by Indication on the Remote Controller Diagnosis Flow 8 Check of error 3 Check of error 4 Check connection status of the connecting wires of outdoor multi. Check if the wiring has Replace the any connection error or outdoor unit main broken, or is about to PCB.
  • Page 316 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models VRVII, -WII and -WIII Series 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...
  • Page 317 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the outdoor (outside) units multi connection Fix the outdoor transmission wiring (outside) units normal? multi connection transmission...
  • Page 318 Troubleshooting by Indication on the Remote Controller SELECT is set to "SLAVE." Check and see if the Fix the problem. following items are normal. External control adaptor for outdoor (outside) unit •Is there continuity? •Does the cool/heat unified address match? Outdoor (outside) unit (unified master unit) •Is there continuity?
  • Page 319 Troubleshooting by Indication on the Remote Controller 3.65 Transmission Error between Main and Sub Remote Controllers Remote Controller Display Applicable Models All indoor models 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 320 Troubleshooting by Indication on the Remote Controller 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 remote controller Set SS1 to PCBs is set to "MAIN";...
  • Page 321 Troubleshooting by Indication on the Remote Controller 3.66 Transmission Error between Indoor and Outdoor Units in the Same System Remote Controller Display Applicable Models All indoor models VRVIII, III-S and III-Q Series Method of Error Detection Detect the abnormal signal for the other indoor units within the circuit by outdoor unit PCB Error Decision Conditions When the error decision is made on any other indoor unit...
  • Page 322 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Turn ON all indoor units. All the units are Continue the indicating “U9”. operation.
  • Page 323 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models All indoor models VRVII, II-S, -WII and -WIII Series Method of Error Detection Detect the abnormal 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 324 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution " " has been displayed for 2 Re-diagnose by minutes or display after more.
  • Page 325 Troubleshooting by Indication on the Remote Controller The " " display blinks on the remote controllers of other Refer to failure units within the same diagnosis for refrigerant " " error code. system. Refer to failure diagnosis for " " error code.

  • Page 326: Outdoor Units, Indoor Units And Remote Controller

    Troubleshooting by Indication on the Remote Controller 3.67 Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Remote Controller Display Applicable Models All indoor models VRVIII and III-Q Series Method of Error Detection A difference occurs in data by the type of refrigerant between indoor and outdoor units.
  • Page 327 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the LED lamps for “Check 3” corresponding to the error code “ ”...
  • Page 328 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 1 Check 3 Check 4 number of indoor units connected to the Replace the same refrigerant circuit outdoor unit main...
  • Page 329 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 3 Check 3 Check 4 Check if the outdoor unit PCB is replaced with a spare PCB.
  • Page 330 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models All indoor models VRVIII-S Series Method of Error Detection A difference occurs in data by the type of refrigerant between indoor and outdoor units. The number of indoor units is out of the allowable range. Incorrect signals are transmitted among the indoor unit, BS unit, and outdoor unit.
  • Page 331 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the LED lamps for “Check 3” corresponding to the error code “ ”...
  • Page 332 Troubleshooting by Indication on the Remote Controller Check 3 Check 4 To Diagnosis Flow 7 (Defective wiring between BS units) Check 3 Check 4 To Diagnosis Flow 8 (Defective wiring between indoor units and BS units)
  • Page 333 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 1 Check 3 Check 4 number of indoor units connected to the same refrigerant Replace the circuit system should...
  • Page 334 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 3 Check 3 Check 4 Check if the outdoor unit PCB is replaced with PCB for spare parts.
  • Page 335 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 4 Check 3 Check 4 Is a single unit Procure the installed? correct model of unit.
  • Page 336 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Diagnosis Flow 6 Check 3 Check 4 Is the wiring between the Correct the outdoor unit and the wiring.
  • Page 337 Troubleshooting by Indication on the Remote Controller Remote Controller Display Applicable Models All indoor models VRVII, II-S, -WII and -WIII Series Method of Error Detection Detect abnormalities in combination of indoor and outdoor (outside) units and the remote controller using the outdoor (outside) unit PCB.
  • Page 338 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Is the outdoor (outside) The refrigerant PCB replaced to spare classification has PCB ? not been set yet.
  • Page 339 Troubleshooting by Indication on the Remote Controller Does the refrigerant type of Matches the indoor and outdoor refrigerant type (outside) unit of indoor and match? outdoor (outside) unit. Replace the outdoor (outside) unit PCB. Note: ∗ The number of indoor units that can be connected to a single outside unit system depends on the type of outside unit.

  • Page 340: Centralized Remote Controller

    Troubleshooting by Indication on the Remote Controller 3.68 Address Duplication of Centralized Remote Controller Remote Controller Display Applicable Models All indoor models Centralized remote controller 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 341: Centralized Remote Controller And Indoor Unit

    Troubleshooting by Indication on the Remote Controller 3.69 Transmission Error between Centralized Remote Controller and Indoor Unit Remote Controller Display Applicable Models All indoor models intelligent Touch Controller Centralized remote controller Schedule timer Method of Error Detection Micro-computer checks if transmission between indoor unit and centralized remote controller is normal.
  • Page 342 Troubleshooting by Indication on the 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 the transmission error (UE) caused on all indoor units?
  • Page 343 Troubleshooting by Indication on the Remote Controller Was the centralized control Check whether group No. for indoor or not there are unit changed? no problems with the transmission wiring length, types of cables and wires, number of units connected, and others.
  • Page 344 Troubleshooting by Indication on the Remote Controller Check transmission wiring between centralized control equipment for any Abnormal broken wire. For details, Correct the refer to information in the wiring. “Procedure for checking broken wires” section. CHECK 13 Normal Check transmission wiring with the master unit centralized control...
  • Page 345 Troubleshooting by Indication on the Remote Controller the master unit central setting Correct the connector been connection of the connected? connector. Disconnect the transmission wiring of the master unit centralized control equipment, and then check the voltage between the transmission terminals (F1 and F2) of the master unit transmission equipment...
  • Page 346 Troubleshooting by Indication on the Remote Controller 3.70 System is not Set yet Remote Controller Display Applicable Models All indoor models All outdoor unit series 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 347 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Are the Open the stop stop valves opened? valve. Is the check operation carried out? Is indoor - outdoor and...
  • Page 348 Troubleshooting by Indication on the Remote Controller 3.71 System Abnormality, Refrigerant System Address Undefined Remote Controller Display Applicable Models All indoor models All outdoor unit series 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 349 Troubleshooting by Indication on the Remote Controller 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 350 Troubleshooting by Indication on the 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 Replace the for all indoor units in indoor unit PCB.
  • Page 351 Troubleshooting by Indication on the Remote Controller Check for causes of rise in high CHECK 1 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 352 Troubleshooting by Indication on the 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 353 Troubleshooting by Indication on the Remote Controller Check for causes of drop in low CHECK 2 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...
  • Page 354 Troubleshooting by Indication on the 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 355 Troubleshooting by Indication on the Remote Controller 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 356 Troubleshooting by Indication on the Remote Controller Check the Factors of Overheat CHECK 3 Operation Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Hot gas circuit clogging ← Are the coil resistance and Defective insulation normal? solenoid valve coil Defective...
  • Page 357 Troubleshooting by Indication on the Remote Controller Defective ← Are the coil resistance and Defective indoor unit valve coil insulation normal? electronic Defective expansion [In cooling] valve body If the indoor valve unit electronic ← Is the connector properly Defective gas expansion pipe connected?
  • Page 358 Troubleshooting by Indication on the Remote Controller Note: ∗1. Refer to “Low pressure protection control” for hot gas bypass control. ∗2. Refer to “Subcooling electronic expansion valve control”. ∗3. “Superheating temperature control” in cooling is conducted by indoor unit electronic expansion valve. ∗4.

  • Page 359: Power Transistor Check

    Troubleshooting by Indication on the Remote Controller Power Transistor Check CHECK 4 Perform the following procedures prior to check. (1) Power OFF. (2) Remove all the wiring connected to the PCB where power transistors are mounted on. [Preparation] ∗ Prepare the analog Multiple tester type of multiple tester.
  • Page 360 Troubleshooting by Indication on the Remote Controller When using the digital type of multiple tester, make measurement in diode check mode ( Measuring Judgement point Remarks Criteria – Due to condenser charge and so on, resistance 1.2V and more measurement may require some time.
  • Page 361 Troubleshooting by Indication on the Remote Controller [PCB and Circuit Diagram] IGBT X10A X11A...
  • Page 362 Troubleshooting by Indication on the Remote Controller Check for causes of wet operation. CHECK 5 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Defective crankcase heater Refrigerant accumulation Frequent ON/OFF of compressor ← Refer to [CHECK 11] Overcharge of refrigerant Defective...
  • Page 363 Troubleshooting by Indication on the Remote Controller ← Does the heat exchanger Dirty evaporator get clogged? Degraded ← Can the fan motor Decreased Defective evaporating fan output fan motor be rotated with capacity hands? Decreased Are the motor coil airflow resistance and rate insulation normal?
  • Page 364 Troubleshooting by Indication on the Remote Controller Check for overcharge of refrigerant. CHECK 6 In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control.
  • Page 365 Troubleshooting by Indication on the Remote Controller The outdoor unit electronic expansion valve is closed due to the overload control. Heating Frequency comes to the minimum level. (High pressure is maintained at a constant level.) High pressure High pressure drops or rises immediately after the overload control is complete.
  • Page 366 Troubleshooting by Indication on the Remote Controller Check for shortage of refrigerant. CHECK 7 In case of VRV Systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control.
  • Page 367 Troubleshooting by Indication on the Remote Controller Heating The opening degree of the outdoor unit electronic expansion valve becomes larger. The outdoor unit electronic expansion valve fully opens and frequency increases. Discharge pipe or low pressure drooping control Frequency comes to High pressure the minimum level.
  • Page 368 Troubleshooting by Indication on the Remote Controller Vacuuming and dehydration CHECK 8 procedure Conduct vacuuming and dehydration in the piping system following the procedure for <Normal vacuuming and dehydration> described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for <Special vacuuming and dehydration>...
  • Page 369 Troubleshooting by Indication on the Remote Controller <Special vacuuming and dehydration> - In case of moisture may get mixed in the piping∗ (1) Vacuuming and dehydration • Follow the same procedure as that for 1) Normal vacuuming and dehydration described above. (2) Vacuum break •...
  • Page 370 Troubleshooting by Indication on the Remote Controller List of inverter-related error codes CHECK 9 Condition for Code Name Major cause determining error Instantaneous • Inverter output current • Liquid sealing overcurrent of exceeds 32.3A even • Defective inverter instantaneously. compressor compressor •...
  • Page 371 Troubleshooting by Indication on the Remote Controller Condition for Code Name Major cause determining error Defective • No output is given. • Defective heavy inverter PCB current part of compressor Defective • The compressor • Liquid sealing or startup of motor fails to start up.
  • Page 372 Troubleshooting by Indication on the Remote Controller Concept of inverter-related error CHECK 10 codes Transmission error When transmissions between the main PCB Main (Service and the inverter PCB monitor) PCB are not normal Instantaneous overcurrent of inverter compressor (When inverter output current exceeds 460V units: 32.3A 230V units: 59.1A even instantaneously)
  • Page 373 Troubleshooting by Indication on the Remote Controller Error codes related to Instantaneous compressor current overcurrent 460V: 32.3A (230V: 59.1A) Compressor overcurrent (Electronic thermal 2) Compressor overcurrent (Electronic thermal 1) 460V: 19.0A 5 consecutive sec. (230V: 33.5A) 460V: 16.1A 260 consecutive sec. (230V: 27.6A) Max.
  • Page 374 Troubleshooting by Indication on the Remote Controller Thermistor Resistance / Temperature CHECK 11 Characteristics For radiation fin thermistor k Ω k Ω T°C T°C 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...
  • Page 375 Troubleshooting by Indication on the 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 k Ω k Ω T°C T°C 361.7719 10.6281 265.4704 8.7097 196.9198 7.1764...
  • Page 376 Troubleshooting by Indication on the Remote Controller For discharge pipe thermistor k Ω k Ω T°C T°C 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...

  • Page 377: Pressure Sensor

    Troubleshooting by Indication on the Remote Controller Pressure Sensor CHECK 12 = 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 378 Troubleshooting by Indication on the Remote Controller Broken Wire Check of the Connecting CHECK 13 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 379 Troubleshooting by Indication on the Remote Controller "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. If there is no continuity, the transmission wiring may have broken wires.
  • Page 380 Troubleshooting by Indication on the Remote Controller Master Unit Centralized Connector CHECK 14 Setting Table The master unit centralized setting connector (CN1/X1A) is mounted at the factory. To independently use a single unit of the intelligent Touch Controller or a single unit of the centralized remote controller, do not dismount the master unit centralized setting connector (i.e., use the connector with the factory setting unchanged).
  • Page 381 Troubleshooting by Indication on the Remote Controller Note: ∗1. The intelligent Touch Controller and the schedule timer are not available for combined use. ∗2. The intelligent Touch Controller, centralized remote controller, and the unified ON/OFF controller have been set to "Provided with the master unit centralized setting connector"...
  • Page 382 Troubleshooting by Indication on the Remote Controller Master-Slave Unit Setting Table CHECK 15 Combination of intelligent Touch Controller and Centralized Remote Controller Master Slave ∗ Master/ Master/ Master/ Master/ Pattern 1-00~4-15 5-00~8-15 1-00~4-15 5-00~8-15 Slave Slave Slave Slave Master Master Slave Slave Master...
  • Page 383 Troubleshooting by Indication on the Remote Controller Check on connector of fan motor CHECK 16 (Power supply cable) (1) Turn OFF the power supply. Measure the resistance between phases of U, V, W at the motor side connectors (three-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.
  • Page 384 Troubleshooting by Indication on the Remote Controller Check on connector of fan motor CHECK 17 (Signal cable) (1) Turn OFF the power supply. (2) Measure the resistance between Vcc and each phase of U, V, W and GND and each phase at the motor side connectors (five-core wire) to check that the values are balanced within the range of ±...
  • Page 385 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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