20
Single Packaged Air Conditioner
Electronic parts Troubleshooting Guide
Is the heater LCD "ON"?
Is the output
voltage of IC03D on the
MAIN PCB DC5V?
1. Reconnecting power supply.
Press Heater Key.
Is the heater operation?
1. Select heater operation mode.
Is the output
voltage of IC02M's 15, 16PIN on the
MAIN PCB 0V?
Is the magnetic contactor for
heater ON?
Check or exchange E/Heater.
1. Set following.
'Set temp. > Room temp.'
1. Check or exchange IC03D,
IC02D on the MAIN PCB.
Is the voltage
between A/B(Heat B) of CN-HEAT
and NEUTRAL 220V?
1. Check or exchange IC02M.
1. Check or exchange RY13/RY14(Heat A, B).
Set temp. > Room temp.?
1. Check the wiring of Magnetic
contactor.
2. Exchange Magnetic contactor.
YES
YES
YES
NO
YES
YES
NO
YES
NO
NO
NO
NO
YES
NO
Possible trouble 6
: No heater operation performed.
