Service Manual
19
Electronic parts Troubleshooting Guide
YES
YES
YES
NO
YES
Is the cooling mode?
Is the output
voltage of IC03D on the MAIN
PCB DC5V?
1. Press cooling operation key.
2. After reenergizing power supply,
press power "ON/OFF" button.
YES
NO
Is the unit operating?
1. Press power ON/OFF button.
Is the output
voltage of IC01M's 11,12(COMP B)PIN
on the MAIN PCB DC0V?
Is the magnetic contactor
for compressor ON?
1. Check Compressor and
Capacitor for Compressor.
NOTE:
3ø model has not capacitor for compressor.
YES
NO
1. Set following.
'Set Temp. < Room Temp.'
NO
NO
1. Check or exchange IC03D
on the MAIN PCB.
NO
YES
Is the voltage
between A/B(COMP B) of CN-COMP
and NEUTRAL 220V?
NO
1. Check or exchange IC01M.
2. Check 3-minutes time delay.
1. Check or exchange RY4/RY5(COMP B).
Set Temp. < Room Temp.?
1. Check the wiring of Magnetic
contactor.
2. Exchange Magnetic contactor.
Possible trouble 5
: No cooling operation performed.
