19
SYMPTON
POSSIBLE CAUSE
Fan motor noisy.
1. Condenser fan blade or evaporator blower
wheel.
2. Loose power clamp or set screw.
3. Worn bearings.
4. Grommets (if applicable).
Compressor will not run, but fan motor runs.
1. Voltage.
2. Wiring.
3. Selector switch.
4. Temperature control.
5. Capacitor. (Discharge capacitor before testing.)
6. Compressor.
7. Motor protector (external).
8. Motor protector (internal).
9. Electronic control (if applicable).
10. Hard starting.
Compressor cycles on motor protector.
1. Voltage.
2. Motor protector (external).
3. Motor protector (internal).
4. Fan motor.
5. Condenser air flow restriction.
6. Condenser fins damanged.
7. Capacitor.
8. Wiring.
9. Refrigerant system.
Insufficient cooling.
1. Low capacity.
2. Air filter.
3. Exhaust door open.
4. Unit undersized.
Excessive noise.
1. Evaporator blower wheel.
2. Condenser wheel.
3. Copper tubing.
4. Compressor internal noise.
5. Fan motor.
Excessive water or condensation.
1. Unit operating under extremely high humidity
conditions.
No cooling.
1. Refrigerant leak.
Unit is cooling but room is not cool.
1. Amps and watts.
2. Sealed refrigeration system.
Wattage decreases slowly until abnormally low.
1. Undercharged, restricted strainer or plugged
restrictor tube.
Wattage decreases immediately.
1. No refrigerant.
2. Compressor defective.
Wattage continuously high.
1. Refrigerant overcharge.
