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Mitsubishi Heavy FD Split Systems Fault Basic Fault Codes
No indication   Normal operation/No mains power or open phase
LCD flashes     Open circuit or poor connections between indoor/outdoor units
E1  Indoor printed circuit board failure/group indoor unit one or more switched off/ Check remote wiring and connections
E5  Outdoor printed circuit board failure
E6  Indoor Heat exchanger thermistor faulty/poor connection?
E7  Indoor return thermistor defective/poor connection?
E9  Drain motor failure Indoor cassette.
E10  Number of indoor units permitted on one controller exceeded
E14  Incorrect setting of slave and master units
E16  Faulty indoor cassette fan motor
E28  Failure between sensor and controller
E34  Low current detected or open phase
E35  Cooling high pressure alarm
E36  Discharge Temp too high (low on gas) or thermistor defective
E37  Outdoor heat exchange sensor faulty/poor connection
E38  Outdoor air temp sensor faulty
E39  Compressor discharge sensor faulty
E40  High pressure Alarm
E41  Power inverter transistor overheat
E42  High current to the compressor detected
E45  Transmission error between indoor and outdoor units

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