Mitsubishi Heavy Industries SRK Series Specifications Page 45

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Over heat of compressor
[Gas shortage, defective discharge
pipe sensor]
Error of signal transmission
[Wiring error including power cable, defective indoor/
outdoor unit PCB, error on power supply system]
Is discharge pipe sensor
resistance value good?
(page 41)
Is sufficient quantity of refrigerant
circulated?
Defective inverter
YES
YES
NO
NO
YES
NO
Check if there are any
places where gas is leaking.
Connector connection check, resistance
value check, replacement of discharge pipe
sensor
Does trouble persist after
charging gas?
Clogged capillary tube or
strainer, defective EEV, etc.
Does error persist after power
reset?
Is there any wrong connection on
indoor/outdoor unit wiring?
Is DC 0~Approx. 12V detected
between 2~3 terminals on
indoor unit terminal block?
YES
YES
NO
NO
YES
NO
Trouble by transient cause, not unit trouble.
Correct improper wire connection on indoor/
outdoor unit.
Defective indoor unit PCB
YES
YES
YES
NO
NO
NO
Is DC 0~Approx. 12V detected
between2~3 terminals on
outdoor unit terminal block?
Is AC 220/230/240V applied
between 1~2 on the outdoor side
terminal block?
Defective indoor unit PCB. Check crossover wires.
Is there any problem on the power
supply line (fuse, reactor,
capacitor, etc.)?
Replace fuse, reactor or capacitor.
Defective outdoor unit PCB
Check crossover wires.
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