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SYMPTON
Fan motor noisy.
Compressor will not run, but fan motor runs.
Compressor cycles on motor protector.
Insufficient cooling.
Excessive noise.
Excessive water or condensation.
No cooling.
Unit is cooling but room is not cool.
Wattage decreases slowly until abnormally low.
Wattage decreases immediately.
Wattage continuously high.
POSSIBLE CAUSE
1. Condenser fan blade or evaporator blower
wheel.
2. Loose power clamp or set screw.
3. Worn bearings.
4. Grommets (if applicable).
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.
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.
1. Low capacity.
2. Air filter.
3. Exhaust door open.
4. Unit undersized.
1. Evaporator blower wheel.
2. Condenser wheel.
3. Copper tubing.
4. Compressor internal noise.
5. Fan motor.
1. Unit operating under extremely high humidity
conditions.
1. Refrigerant leak.
1. Amps and watts.
2. Sealed refrigeration system.
1. Undercharged, restricted strainer or plugged
restrictor tube.
1. No refrigerant.
2. Compressor defective.
1. Refrigerant overcharge.
60
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