Mitsubishi Electric SRK19CIS, Technical Manual

Page: 38 / 65

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37
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Over heat of compressor
[Gas shortage, defective discharge
pipe sensor]
Is discharge pipe sensor
resistance value good?
(page 36)
Is sufficient quantity of refrigerant
circulated?
Defective outdoor unit PCB
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.
Error of signal transmission
[Wiring error including power cable, defective indoor/
outdoor unit PCB]
Does error persist after power
reset?
Are the lines connecting the indoor
and outdoor units connected
normally?
Is DC 0~Approx. 12V detected
between
~ 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
NO
NO
Is DC 0~Approx. 12V detected
between
~ terminals on
outdoor unit terminal block?
Is AC 220V applied between
~ on the outdoor side terminal
block?
Defective indoor unit PCB. Check crossover wires.
Defective outdoor unit PCB
Check crossover wires.
2 3
2 3
1 2