58
Service Manual
Installation and Maintenance
9. Troubleshooting
The unit does not
operate after
power on
Fuse is burnt out, power cord is not
well plugged, there is no power supplied
for socket or wire inside the unit is loose.
Check if there is power supplied for the socket of
the unit, and then check if the plug and socket
contact well. At last check if the wire inside the
unit is correct.
The fan motor doesn’t
operate after power
on
Incorrect wiring
Fan capacitor has open circuit or
short circuit.
Winding of motor has open or short
circuit, or temperature limiter is broken
due to overheating.
Replace motor or temperature limiter
Re-wiring
Replace capacitor of fan
Power failure or the fuse is burnt out.
Check if there is power failure, or if
socket is good, or if the plug is loose.
Repair socket and replace the
damaged fuse.
Supply voltage is too low.
If the voltage of power supply is 10%
lower than the rated voltage, find out
the cause.
On-off button has malfunction.
Press the on-off button. Check if it is in
conducting state. If it is not conducted or
not conducted well, replace the button
with the same model
.
The unit does
not operate.
Motor of compressor is burnt out.
If winding of motor of completely
hermetic compressor has short circuit,
or open circuit, replace the
compressor.
Compressor has malfunction.
Knocking the shell of compressor with
rubber stick may make the
compressor operate. If it doesn’t work,
replace the compressor.
Failure of crystal oscillator or
reset circuit.
Replace components with failure.
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