Mitsubishi Heavy air conditioner error codes
Indicator lamps and blink codes
By model series
All codes
0Normal01Error of wired remote control wiring (When wired remote control was connected) (When wireless LAN interface…05Can not receive signals for 35 seconds (if communications have recovered)11Start of compressor program12Below 20 rps13Over 20 rps14Over voltage (DC350V)15Short circuit of power transistor (high voltage side)16Power cut, loop failure17Software current cut21Abnormal result of PWM algorithm22Input below 2A (PWM above 90%)233 abnormal stops within 20 min27Error of outdoor fan motor (for DC motor only)28Different voltage29Low voltage31Cooling safe current I32Heating safe current I33Cooling safe current II34Heating safe current II35Cooling high pressure control36Compressor overheat 110°C37High pressure eror (ball valve closed)38Outdoor air temperature sensor is abnormal39Discharge pipe sensor is abnormal (anomalous stop)40Service valve (gas side) closed operation41Cooling overload 1 (outdoor temp. 36~40℃)42Current cut43Cooling overload 2 (outdoor temp. 40~45℃)44Heating overload 2 (outdoor temp. 12~17℃)45Cooling overload 3 (outdoor temp. 45~℃)46Heating overload 3 (outdoor temp. 17~℃)47Active filter voltage error48Outdoor unit's fan motor is abnormal50125℃ (compressor over heat)51Short circuit in the power transistor (high side) / Current cut circuit breakdown57Refrigeration cycle system protective control58Current safe59Compressor wiring is unconnection / Voltage drop / Low speed protective control60Rotor lock61Connection lines between the indoor and outdoor units are faulty62Serial transmission error70Rotor lock71Rotor lock: below 16 rps72Rotor lock: above 16 rps73Poor phase position switching (U phase)74Poor phase position switching (V phase)75Poor phase position switching (W phase or not determined)76Start of compressor program (within 4 sec. after phase position switching)77Abnormal low pressure80Error of fan motor of indoor unit81Vent-pipe sensor error (abnormal stop)82Indoor heat exchanger sensor is abnormal (anomalous stop)83Heat exchanger liquid pipe sensor error (abnormal stop)84Anti-condensation control85Anti-frost control86High pressure control87Compressor over heat protection control88Refrigeration cycle system protective control97Compressor over current (Overload) cut offE0Transmitting/receiving signal errorE1Indoor circuit board faultE2Indoor unit address: duplication of indoor unit number when addressing with the remote controllerE3Outdoor unit powerE4Incorrect addressE5Interconnecting cableE6Indoor coil sensorE7Indoor return air sensorE8Abnormality of the heat exchanger sensor inputE9Drain motor [DM] failure (drain motor open circuit or the drain motor is disconnected from the indoor PCB)ENDischarge thermistor short/openF1Reverse phase detectionF2L3 open phase detectionF363L connector openF7Reverse phase detector circuit (p.c.board) faultF8Input circuit faultF9Connector 2 or more openFRL2-phased open phase or 51CM connector openHD49C connector openLFCompressor over current (start-up locked) cut offP1Intake air sensor abnormalP2pipe sensor abnormalP3System error (Transmitting/receiving signal)P4Drain sensor abnormalP5Malfunctioning of the drain overflow protecting mechanismP6Abnormality of the coil frost/overheating protection modesP7System error (Address)P8Outdoor unit malfunctionPNOver heat protectionU1Abnormal high pressure (High pressure switch 63H worked)U4Outdoor thermistor short/openUFCompressor over current (operating locked) cut offUHCurrent sensor errorURCompressor over current (Terminal relay operation)102Inner thermostat (49C) operation111Direct cut operationE1017 or more indoor units are connected to one remote controller (maximum permitted: 16 indoor units)E11More than one indoor unit is connected to a remote controller while trying to address the unit from the remote…E12While trying to auto address, one or more of the units (either indoor or outdoor) is not set at 49E14Incorrect setting of SW2 on indoor unit PCB when setting up a master / slave system. Incorrect control wiring…E16Faulty indoor fan motorE28Failure of the sensor within the remote controllerE30Indoor/outdoor unit connected errorE31Outdoor unit address faultE32Outdoor unit power supply phase faultE33Compressor current abnormally high or open phaseE34Compressor current abnormally low (or no current) on L3, or open phase on L3E35Compressor discharge gas temperature abnormally highE36Compressor discharge temperature abnormally highE37Outdoor heat exchanger sensor [ThOR] defective (open circuit) or poor sensor connectionE38Outdoor air sensorE39Compressor discharge temperature sensorE40High pressure switchE41Inverter power transistorE42Compressor currentE43Number of indoor unitsE45Inverter wiringE46Address settingE47Inverter over voltageE48DC Outdoor Fan motor faultE49Low voltage detectedE51Inverter PCB faultE53Suction pipe thermistor (Tho-S) disconnectedE54Low pressure sensor (PSL) disconnected/output errorE55Compressor under dome thermistor disconnectedE56Power transistor thermistor faulty or disconnected (FDCVA151-251)E57Indoor heat exchanger sensorE58Compressor start-up errorE59Compressor start-up errorE60Compressor position detection errorE63Emergency stop of indoor unitE37-1Outdoor heat exch thermistor failure (Tho-R1)E37-2Outdoor heat exch thermistor failure (Tho-R2)E37-3Outdoor heat exch thermistor failure (Tho-R3)E37-4Outdoor heat exch thermistor failure (Tho-R4)E37-5Outdoor heat exch thermistor failure (Tho-SC)E37-6Outdoor heat exch thermistor failure (Tho-H)E54-1Low pressure sensor (PSL) disconnection/output errorE54-2High pressure sensor (PSH) disconnection/output errorNO INDICATIONMains power: no mains power detected or T phase wire openLED:RUN=1-TIME FLASH,TIMER=ONHeat exchanger temperature sensor 1 errorLED:RUN=2-TIME FLASH,TIMER=ONRoom air temperature sensor errorLED:RUN=3-TIME FLASH,TIMER=ONHeat exchanger temperature sensor 2 errorLED:RUN=4-TIME FLASH,TIMER=ONTrouble of wireless LAN interfaceLCD FLASHES CONTINUOUSLY OR OFFOpen circuit or poor indoor/outdoor interconnecting wiring