Over Heat Of Compressor; Error Of Signal Transmission - Mitsubishi Heavy Industries SRK20ZJ-S Data Book

Over heat of compressor

Is discharge pipe sensor
resistance value good?
Is sufficient quantity of refrigerant
circulated?
Defective outdoor PCB

Error of signal transmission

Does error persist after power
reset?
Are the lines connecting the indoor
and outdoor units connected
normally?
Is DC 0~Approx. 20V detected
between ② ~ ③ terminals on
outdoor terminal block?
Is DC 0~Approx. 20V detected
between ② ~ ③ terminals on indoor
terminal block?
Is AC 220/230/240V applied between
① ~ ② on the indoor terminal block?
NO
(page 0)
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Defective indoor PCB

-
Gas shortage, defective discharge
pipe sensor
Connector connection check, resistance
value check, replacement of discharge pipe
sensor
Does trouble persist after
charging gas?
YES
Clogged capillary tube or
strainer, defective EEV, etc.
Wiring error including power cable, defective indoor/
outdoor PCB
Trouble by transient cause, not unit trouble.
Correct improper wire connection on indoor/
outdoor unit.
Defective outdoor PCB
Check crossover wires.
Defective outdoor PCB. Check crossover wires.
-
'09•SRK-DB-087D
NO Check if there are any
places where gas is leaking.