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Electronic parts Troubleshooting Guide
Is the unit operating?
Is the output
voltage of Micom's 10PIN on
the MAIN PCB 5V?
Is the "Power relay" for
indoor motor OK?
Check the indoor motor.
1. Press power ON/OFF button.
2. Reconnect the power supply.
Is the voltage
between 1PIN of CN8 and
NEUTRAL 220V?
1. Check or exchange IC01D,
IC02D on the main PCB.
1. Check or exchange RY10.
1. Check the wiring of
"Power relay".
2. Exchange "Power relay".
YES
YES
YES
NO
NO
NO
YES
NO
Is the compressor operating?
1. Check wiring for outdoor
motor and magnetic contactor.
2. Check outdoor motor & capacitor.
Is it cooling operation?
1. Press power "ON/OFF" button.
2. Select cooling operation.
1. Set following.
Set temp. < Room temp.
2. Wait, if the unit has operating
with 3-minute time delay.
YES
NO
YES
NO
Possible trouble 8
: Indoor motor does not operate.
Possible trouble 9
: Outdoor motor does not operate.
