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D2
SYMPTOM DIAGNOSIS REMEDY
Both fan & compressor not running.
Fuse open or breaker tripped. Inspect and repair.
Poor power plug connection. Inspect.
Power failure. Inspect.
Control circuit malfuction. Replace parts.
Compressor does not run. Compressor motor windings open. Replace compressor.
Compressor locked. Replace compressor.
Defective overload. Replace part.
Defective capacitor. Replace part.
Control circuit malfuction. Replace part.
Voltage drop at start. Check supply wiring.
Pressure unequal at start. Restart in 10 minutes. Inspect Control Circuit.
Fan does not run. Fan motor windings open. Replace part.
Defective capacitor. Replace part.
Control circuit malfunction. Replace part.
Defective bearing. Replace part.
Fan blade interference. Inspect.
Unit operates but does not cool. Refrigerant circuit oil leak. Leak repair and replenish gas.
Small or no sound of refrigerant flow. leak repair and replenish gas, or
Low system temperature / pressure. defective compressor. Replace part.
Small or no sound of refrigerant flow. System restriction; replace capillary tube
High rise in temperature / pressure of and strainer.
condenser (frost forms on evaporator).
Poor cooling. Incorrect thermostat setting. Adjust.
Open door or window. Correct.
Air inlet or outlet obstructed. Correct.
Unit exposed to sun. Draw curtains.
Additional heat sources or occupants. Recalculate cooling load.
Poor installation location. Consider relocation.
Incorrect cooling load calculation. Recalculate cooling load, resize.
Dirty filter. Clean filter.
Overcooling. Incorrect cooling load calculation. Adjust fan speed and thermostat setting.
Recalculate cooling load, resize.
High level of noise and vibration. Compressor noise or vibration. Check compressor mounting & isolation.
Tubing noise and vibration. Redress tubing.
Fan motor noise or vibration. Check fan motor mounting.
Check for broken fan blade.
Radio noise and interference. Defective electrical contact. Repair.
Water leaks. Drain pipe blocked. Inspect and repair.
Drain pipe blocked. Inspect and repair.
Improper installation. Inspect and repair.