Sharp AF-S100RX, Service Manual

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Section 3 Troubleshooting and Testing
3 -3
Symptom
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.
Evaporator coil partially frosted.
Evaporator completely iced.
Fan motor will not rotate during heat
cycle. (Heat/Cool models only.)
Air conditioner will not operate.
Air from unit does not feel cold
enough.
Possible Cause
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.
1. System low on refrigerant.
1. Low outside temperature.
1. Thermostatic drain valve. (Water level control, if applicable.)
1. Wall plug disconnected. Push plug firmly into wall outlet.
2. House fuse blown or circuit breaker tripped. Replace fuse with time delay
type or reset circuit breaker.
3. Control is OFF. Turn Control ON and set to desired FAN or COOL setting.
4. Unit turned off and then on too quickly, wait 3 minutes before compres-
sor will automatically restart.
5. Thermostat set too High. Adjust thermostat to lower number for cooling
1. Room temperature below 60°F (16°C). Cooling may not occur until room
temperature rises above 60°F (16°C).
2. Temperature sensor touching cold coil, located behind air filter. Pull sen-
sor away from coil.
3. Reset to a Lower temperature.
4. Compressor shut-off by changing modes. Wait approximately 3 minutes,
and listen for compressor to restart when set in the COOL modes.