KX & PAC Trouble Shooting Guide - …

1 KX & PAC TroubleShooting GuideMITSUBISHI HEAVY INDUSTRIES- MAHAJAK AIR CONDITIONERS CO.,LTD. System Troubleshooting Procedure VRF INVERTER MULTI-SYSTEM AIR CONDITIONERS KX4 series and KX6 series Error on indoor unit or outdoor unit? Indoor unit Outdoor unit Is the remote controller connected? Was the power supply reset after the error occurred? Connect the maintenance PC and resume operation. Save the monentary data just before error occurrence, retained in the remote controller Connect the maintenance PC and resume operation. Collected data 30 minutes before error occurrence are saved in the maintenance PC. Momentary data just before error occurrence are saved in the maintenance PC. Connect the maintenance PC and resume operation. Connect the maintenance PC and resume operation.

2 NO YES YES NO *The data mentioned below is a reference value at 20 degrees celsius. - -E20 -Indoor fan motor rotationtion speed anomaly (FDT, FDTC, FDK, FDTW)DC fan motor revolution speed anomaly, Indoor power (control) PCB anomaly, Foreign material at rotational area of fan motorE21 -FDT Limit switch is not activatedLimit switch on the panel anomaly, Anomalous mounting position of gille, Connector CNV looseE16 Indoor fan motor anomaly FDT&FDTCFan motor anomaly, Poor connection,Indoor PCB anomalyIndoor fan motor anomaly FDK&FDFWE18 -Address setting error of master and slave indoor remote controllerRemote controller SW address setting error of master and slave indoor -Indoor unit operation check,drain motor check mode anomalyMistake in SW7-1 setting due to forgetting to turn OFF SW7-1 after indoor operation check finishedE10 -Excessive number of indoor unitsby controlling one renote controllerExcessive number of indoor units connected (more than 17 units), Remote controller anomalyE11 -Address setting error (setting with remote controller) When plural indoor units are connected, do not use remote controller address setting methodE12 -Address setting error by mixed setting methodThe atomatic setting and manual setting mixed in the address setting method for indoor unitsE6 -Indoor heat exchanger anomaly (Thi-R)Sensor anomaly, Poor connection, Indoor control PCB anomalyE7 -Indoor return air anomaly (Thi-A)

3 Sensor anomaly, Poor connection, Indoor control PCB anomalyE9 -Drain troubleBlocked drain, Drain pump anomaly, Float switch anomaly, Indoor contyrol PCB anomalyE2 -Duplicated indoor unit addressing more than 49 units connectedNumber of connected indoor units exceeds the limitation, Duplicated indoor unit address, Indoor PCB anomalyE3 -Outdoor unit signal line errorPower is not suppied to outdoor unit, Unmatch of pairing between indoor and outdoor units, Indoor PCB anomaly, Outdoor control PCB anomaly, Missing local wiringE5 -Communication error during operationUnit address No. setting error, Remote control wires broken, Poor connection/ disconnection of remote controller wires, Indoor control PCB anomaly, NoiseRemote Control Error Code7-segment displayDescription of faultPossible CauseE1 -Remote controller communication errorAnomalous communication circuit between remote controller and indoor unit, NoiseMITSUBISHI HEAVY INDUSTRIES - MAHAJAK AIR CONDITIONERS CO.

4 ,LTD. VRF INVERTER MULTI-SYSTEM AIR CONDITIONERS KX4 series and KX6 series *The data mentioned below is a reference value at 20 degrees celsius. (+) (Red)Tester (-) (Black)Resistance (ohm)Remarks1 several M Upper arm U in normal direction2 several M Upper arm V in normal direction3 several M Upper arm W in normal direction4 several M Lower arm U in normal direction5 several M Lower arm V in normal direction6 several M Lower arm W in normal direction7 several 10M Upper arm U in reverse direction8 several 10M Upper arm V in reverse direction9 several 10M Upper arm W in reverse direction10 several 10M Lower arm U in reverse direction11 several 10M Lower arm V in reverse direction12 several 10M Lower arm W in reverse directionE41(E51)E41-1,2(E51-1,2)Power transistor overheatPower transistor anomaly, Power transistor temp.

5 Sensor anomaly, Improperly fixing of power transistor to radiator fin, Inverter PCB anomaly, Outdoor fan motor anomaly, Cooling fan motor for inverter anomaly, Inadequate installation space of outdoor unitE38 -Outdoor air temp. sensor anomaly (Tho-A)Broken sensor harness or the internal wire of sensing section, Poor connection, Outdoor contron PCB anomalyE39E39-1,2 Discharge pipe temp. sensor anomaly (Tho-D1, D2)Broken sensor harness or the internal wire of sensing section, Poor connection, Outdoor contron PCB anomalyE40E40 High pressure anomaly(63H1-1,2 activated)Disconnection of high pressure switch connector, High pressure sensor anomaly, High pressure switch anomaly, Short circuit of airflow at condenser, Close service valveE36E36-1,2 Discharge pipe temp.

6 Sensor anomaly (Tho-D1, D2)Discharge pipe temp. sensor anomaly, Outdoor control PCB anomaly, Short circuit of airflow, Insufficient airflow volume, Insufficient amount of refrigerant, SV1, 2 (liquid refrigerant by pass valve) anomalyE36-3 Liquid flooding anomalyOvercharging of refrigerant, Superheat control anomaly, Circuit of liquid refrigerant by pass anomaly, Discharge pipe temp. sensor anomaly, EEV indoor anomalyE37E37-1,2,3,4E37-5,6 Outdoor heat exchanger temp. sensor (Tho-R) and subcooling coiltemp. sensor (Tho-SC, -H) anomalyBroken sensor harness or the internal wire of sensing section, Poor connection, Outdoor contron PCB anomalyE30E30 Unmatch connection of indoor and outdoor unitIndoor control PCB anomaly, Outdoor control PCB anomalyE31E31 Duplicated outdoor unit address in the address setting of outdoor units, More than 129 indoor units connected, No setting of Master/Slave setting switch for combination L3 phase on power supplyat primary sideAnomalous power supply at primary side, Outdoor control PCB Control Error Code7-segment displayDescription of faultPossible CauseE22 -Wrong connection with Outdoor unit( Indoor unit)

7 Unmatched pairing of indoor and outdoor unit, Indoor control PCB anomaly, Outdoor control PCB anomalyE28 -Remote controller temp. sensor anomaly (Thc)Remote controller temp. sensor anomaly, Poor connection, Remote controller PCB anomalyMITSUBISHI HEAVY INDUSTRIES - MAHAJAK AIR CONDITIONERS CO.,LTD. VRF INVERTER MULTI-SYSTEM AIR CONDITIONERS KX4 series and KX6 series E56E56-1,2 Power transistor anomaly (Tho-P1, P2)Broken sensor harness or the internal wire of sensing section, Poor connection, Outdoor contron PCB anomalyE58E58 Anomalous compressorby loss of synchronismInsufficient time elapsed after the power supplied before compressor startup, Startup compressor without crankcase heater ON, Compressor anomalyE59E59-1,2 Compressor startup failure(CM1, CM2)Anomalous voltage of power supply, Anomalous components for refrigerant circuit, Inverter PCB anomaly, Loose connection of connector or cable, Compressor anomaly (Motor or bearing)E53E53 Suction pipe temp.

8 Sensor anomaly (Tho-S)Broken sensor harness or the internal wire of sensing section, Poor connection, Outdoor contron PCB anomalyE54E54-1,2 High pressure sensor anomaly (PSH)Low pressure sensoe anomaly (PSL)Broken sensor harness, Disconnection of sensor, Sensor (PSH, PSL) anomaly, Outdoor control PCB anomaly, Anomalous installation condition, Insufficient airflow volume, Excessive or insufficient refrigerant amountE55E55-1,2 Under-dome temp. sensor anomaly (Tho-C1, C2)Broken sensor harness or the internal wire of sensing section, Poor connection, Outdoor contron PCB anomalyE46E46 Mixed address setting methodsconexistent in same networkMistake in the address setting, Mistake in the connection of signal wireE48E48-1,2 Outdoor DC fan motor anomalyOutdoor fan motor anomaly, Poor connection, Inverter PCB anomaly, Outdoor control PCB anomalyE49E49 Low pressure anomalyLow pressure sensor anomaly, Service valves closed, EEV anomaly (EEV closed), Insufficient refrigerant amount, Clogging at EEV or strainerE42E42-1,2 Current cut (CM1, CM2)

9 Compressor anomaly, Leakage of refrigerant, Power transistor module anomaly, Anomalous power supply for inverter PCB, Outdoor fan motor anomalyE43E43-1,2 Excessive number of indoor units connected, excessive total capacityMistake in setting of indoor/outdoor unit addresses,Mistake in signal wire connectionE45E45-1,2 Communication error between inverter PCB and outdoor control PCBS ignal wire anomaly, Outdoor control PCB anomaly, Inverter PCB (INV1,2) anomaly, Rush current prevention resistor anomalyRemote Control Error Code7-segment displayDescription of faultPossible CauseMITSUBISHI HEAVY INDUSTRIES - MAHAJAK AIR CONDITIONERS CO.,LTD. VRF INVERTER MULTI-SYSTEM AIR CONDITIONERS KX4 series and KX6 series NoneWAITFuse blown, Noise filter anomaly, Anomalous connection of wire between PCBs, Indoor control PCB anomaly, Remote controller anomaly, Breakage of connecting wires of remote controller, Outdoor control PCB anomalyNoneNo displayFuse blown, Noise filter anomaly, Anomalous connection of wire between PCBs, Indoor control PCB anomaly, Remote controller anomaly, Breakage of connecting wires of remote controller, Outdoor control PCB anomalyNoneLouver motor anomalyLouver motor anomaly, Disconnection/breakage of LM harness, Limit switch anomalyNonePower supply system anomaly(Power supply to indoor unit PCB)

10 Wrong connection or breakage of connecting wires, Blown fuse, Transformer anomaly, Indoor power PCB anomaly, Broken harness, Indoor control PCB anomalyNonePower supply system anomaly(Power supply to remote controller)Remote controller wire breakage/shortccircuit, Remote controller anomaly, Malfunction by noise, Indoor power PCB anomaly, Broken harness, Indoor control PCB anomalyNoneOperates but does not coolPoor compression of compressor,Expansion valve operation anomalyNoneOperates but does not heat4-way valve anomaly, Poor compression of compressor, Expasion valve anomaly operationNoneEarth leakage breaker activitedCompressor anomaly (Grounded),NoiseE61E61 Communication error between the master unit and slave unitsSignal wire anomaly, Outdoor control PCB anomaly, Inverter PCB (INV1,2) anomaly, Rush current prevention resistor anomalyE63E63 Emergency stopFactors for emergency stopE75E75 Central control communication errorPoor connection, faulty controllerRemote Control Error Code7-segment displayDescription of faultPossible CauseE60E60-1,2 Rotor position detection failure(CM1, CM2)Compressor anomaly, Inverter PCB anomaly, Anomaly of power supplyVRF INVERTER MULTI-SYSTEM AIR CONDITIONERS KX4 series and KX6 series MITSUBISHI HEAVY INDUSTRIES - MAHAJAK AIR CONDITIONERS CO.