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Mitsubishi Heavy Error Codes

Every Mitsubishi Heavy error code we have catalogued, with what it means on site — 40 codes in total. In R-Pro, tap any code to get the meaning, likely causes and inspection steps, even with no signal in the plant room.

40 codes
CodeWhat it means
E1Remote control communication error
E2Duplicate indoor unit address
E3Outdoor unit signal line error
E5Communication error during operation
E6Indoor heat exchanger thermistor fault
E7Indoor return air thermistor fault
E9Drain water level fault
E10Too many indoor units on one remote
E12Address setting error (mixed method)
E16Indoor fan motor fault
E19Indoor unload motor control mode fault
E28Remote control thermistor fault
E30Incompatible indoor–outdoor connection
E31Duplicate outdoor unit address
E32Open L3 phase on primary power supply
E36Discharge pipe temp error or liquid overflow
E37Outdoor heat exchanger / sub-cool thermistor fault
E38Outdoor air temp thermistor fault
E39Discharge pipe temp thermistor fault
E40High pressure fault
E42Compressor current cut-out
E43Over-connected indoor units / excess capacity
E45Inverter PCB–outdoor control PCB comm error
E46Mixed address setting methods on network
E48Outdoor DC fan motor fault
E49Low pressure fault
E53Suction pipe temp thermistor fault
E54High/low pressure sensor fault
E55Compressor under-dome thermistor fault
E56Power transistor temp thermistor fault
E58Compressor loss of synchronisation
E59Compressor start failure
E60Compressor rotor position detection failure
E61Main–backup outdoor communication error
E63Emergency stop
P1High pressure protection
P2Low pressure protection
P3Discharge temperature protection
P5Compressor over-current protection
P9Indoor heat exchanger frost/overheat protection

Official Mitsubishi Heavy source / manual ↗

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