Compressor does not operate.
Turn on power supply.
Does compressor delay
three minutes by
temperature changes or
others?
Does OPERATION
indication indicate?
Is it possible to detect AC
220-240V on terminal
block or contactor of
compressor?
Are all of compressor
cords normal?
Is compressor motor
winding normal?(Check
winding resistor.)
Is capacitor for
compressor normal?
Is overload relay normal?
Does compressor start?
Does compressor stop
after a while?
Is gas quantity normal?
(Check gas pressure.)
Microcontroller is defective or
miniature relay is defective..
Is resistance value of room
sensor (Tr) and heat exchanger
sensor (TP1) normal?
Room sensor or heat
exchanger sensor is
defective.
Replace room sensor
or heat exchanger
sensor.
Compressor is defective.
Capacitor is defective.
Overload relay is defective.
Compressor is defective.
Gas shortage (Gas leak)
Compressor is defective.
Replace P.C. board.
Rewire or replace
defective cords.
Replace compressor.
Replace capacitor.
Replace overload
relay.
Supply gas.
Replace compressor.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO NO
NO
NO
NO
NO
NO
NO
NO
Check power supply.
Replace compressor.
Wait three minutes
<Primary check>
(1) Is the room temperature higher than the preset temperature in cooling operation?
(2) Is the crossover cable connected properly?
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