Mitsubishi SCM45ZA User Manual page 37

Outdoor unit e rror
Is output voltage applied to all 3
phases of power transistor?
Is compressor wiring connected
securely?
Inspect compressor. (Broken coil
wire)
Current safe stop
Is refrigerant charge quantity adequate?
Is outdoor ventilation condition good?
Compressor overheat
Is comp. dome thermistor resistance
value good?
Is sufficient quantity of refrigerant
circulated?
Indoor fan motor error
Is connector connection good?
Is voltage applied to fan motor?
(Between White - Red)
NO
YES
NO
YES
YES
YES
Inspect compressor.
YES
Defective inverter
YES
YES
Defective inverter
NO
YES
NO
YES
Defective fan motor
Defective inverter
Connect securely.
[Overload operation, compressor
lock, overcharge]
NO
Discharge refrigerant.
NO
Secure space for inlet and outlet.
Connector connection check, resistance
NO
value check, replacement of comp. dome
thermistor
NO
Does trouble persist after
charging gas?
YES
Clogged capillary tube,
etc.
Correct connector
connection.
Defective indoor unit
PCB
[Broken power transistor,
broken compressor wire]
[Gas shortage, defective
comp. dome thermistor]
NO
Gas shortage
[Defective fan motor,
defective indoor PCB]
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