Service manual

65
E. Check negative phase relay.
F. Check magnetic contactor.
G. Check indoor PCB Ass'y.
H. Check compressor motor protector.
Check negative phase relay to see
if it has operated.
•
Rewire power supply wires.
•
YES
(47C)
Check coil resistance of magnetic
contactor.
•
(MG)
YES
Check compressor motor
internal protector.
•
(49C)
Temperature of compressor is
abnormally high.
Refrigerant gas shortage.
YES
YES
Charge refrigerant gas.
Check compressor.
There is a possibility of
locked rotor.
•
NO 90% or more of
rated voltage.
NO
It’s operated.
Check compressor motor
overcurrent relay. (51C)
•
Clean heat exchanger or
remove obstacles.
•
Check power supply voltage.
Voltage is abnormally low.
•
Outdoor heat exchanger coil
is dirty or there are obstacles
near air suction inlet.