4.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two kinds.
The one is called Starting Failure which is caused by an electrical defect. The other is Ineffective Air Con- ditioning caused by a defect in the refrigeration circuit and improper application.
Unit is running but cooling is ineffective.
Ineffective Cooling
Check cold air circulation for smooth flow.
Dirty indoor coil (heat exchanger)
Malfunction of fan.
Clogging of air filter.
Obstruction at air outlet.
Remove obstruction.
Check clogging in refrigera- tion circuit.
Repair clogging in refrigeration circuit.
Check outdoor coil (heat exchanger) and fan operation.
Check gas leakage.
Repair gas leak.
Replacement of unit if the unit is beyond repair.
Satisfactory operation with temperature difference of inlet & outlet air: 55~59°F (13~15°C)
Check heat load increase.
Clean condenser.
Not on separate circuit
Check inside gas pressure.
Adjust refrigerant charge.
Malfunction of compressor.
Replacement of compressor.
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