Sharp AF-S100RX, Service Manual

Page: 17 / 62

Section 3 Troubleshooting and Testing
3 -2
Symptom
Fan motor will not run.
Fan motor runs intermittently.
Fan motor noisy.
Compressor will not run, but fan motor
runs.
Compressor cycles on motor protector.
No heat.
Possible Cause
1. No power.
2. Power supply cord.
3. Selector switch.
4. Energy saving switch (if applicable).
5. Electronic control (if applicable).
6. Wire disconnected or connection loose.
7. Capacitor. (Discharge capacitor before testing.)
8. Defective fan motor windings.
9. Will not rotate. Fan blade hitting shroud or blower
wheel hitting scroll. (Motor cycles on overload.)
1. Cycle on motor protector.
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 damaged.
7. Capacitor.
8. Wiring.
9. Refrigerant system.
1. No power.
2. Selector switch position.
3. Temperature control position.
4. Fan motor.
5. Heating element.
6. Selector switch.
7. Temperature control.
8. Terminals and connectors.
Troubleshooting Procedures