Repair Section
34
7.3 Troubleshooting Chart
• To accurately troubleshoot the problem, it is important to carefully confirm the nature of the
problem. Common problems are:
- Insufficient cooling.
- Unit does not operate.
- Overflow of drain water.
- Abnormal noise or vibrations.
- Others.
(1) Insufficient cooling
• Cooling system problem generally results from electrical or mechanical components such as fan
motor, compressor, and control switch.
Condition
Possible Cause
Remedy
Insufficient Cooling
Check Area
Cause
Air volume
normal
Compressor
operates.
1. Usage conditions
(high temperature).
Operation near usage limits. Review the installation
place.
2. Dirt in condenser or
evaporator.
Insufficient heat exchange.
Clean fins.
3. Frost in refrigeration cycle.
Clogging at the frost section. Replace clogged section.
4. No temperature difference
between evaporator and
condenser.
Insufficient refrigerant.
Check the leaking part,
then repair and charge
refrigerant.
Compressor
does not
operate.
1. Compressor coil resistance.
(0 ohm or
ohm
Short or open circuit.
Replace compressor.
(In case of short, check
the compressor relay on
the relay board)
2. Compressor on/off relay
(52CM) on the relay board.
Open circuit or insufficient
contact.
Replace relay board.
3. Capacitor for compressor
and fan motor.
Capacitor malfunction.
Replace capacitor.
4. Compressor overload relay.
Overload relay fault.
Replace overload relay.
5. Voltage.
Low voltage.
Repair power supply.
