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10-4 Compressor does not operate.
<Primary check>
(1) Is the preset temperature higher than the room temperature in cooling operation?
(2) Is the crossover cable connected properly?
<Inspection procedure>
-Cooling only model-
Does miniature relay RY04
switch on and off due to
temperature changes?
Turn on power supply.
Does OPERATION lamp blink?
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.)
Compressor is defective.
Replace P.C. board.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO NO
NO
Is resistance value of thermo
sensor (TA) and heat exchanger
sensor (TC) normal?
Microcontroller is defective.
Miniature relay RY04 is defective.
Compressor is defective.
Capacitor is defective.
Overload relay is defective.
Compressor is defective.
Gas shortage (Gas leak)
Refer to 9-6-1 Power
can not be turned on .
Thermo sensor or heat
exchanger sensor
is defective.
Replace thermo
sensor or heat
exchanger sensor.
Replace P.C. board.
Rewire or replace
defective cords.
Replace compressor.
Replace capacitor.
Replace overload relay.
Replace compressor.
Supply gas.
Is it possible to detect
AC 220 − 240 V between
2 and 3 on the terminal block?