Fedders R407C Service Manual page 41

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