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HomeRepair HelpSharp A/C RepairSharp Air conditioner compressor won't run Repair
Sharp Air conditioner compressor won't run
If your Sharp air conditioner compressor won’t run, the fan may still blow while the unit never gets cold because the compressor is not starting. The most likely cause is a failed temperature control thermostat with burned electrical contacts, followed by a defective temperature control board that is not sending voltage to the compressor. A bad thermostat can also keep the compressor from being energized. Next, check the compressor overload, which protects the compressor from excessive current and can be tested for continuity with a multimeter. The compressor itself can fail, but it is usually checked after the overload and capacitor, and compressor replacement should be handled by a licensed technician. A faulty thermistor can also cause an AC compressor not turning on if it cannot properly sense temperature. Whether your Sharp air conditioner compressor is not working because of a thermostat, control board, overload, compressor, or thermistor, enter your model number on RepairClinic.com to find the exact replacement part for your specific air conditioner.
01 - Sharp Air Conditioner Thermostat
The thermostat monitors the temperature of the air. When the air temperature rises above a set point, the thermostat activates a switch to provide power to the fan and compressor. If the thermostat is defective, it may prevent the compressor from running. If you determine that the compressor is at fault, replace it.
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Highly Likely
02 - Sharp Air Conditioner Temperature Control Thermostat
The temperature control thermostat has electrical contacts inside that burn out over time. It is possible for the thermostat to still turn on the fan motor but not the compressor motor.
Highly Likely
03 - Sharp Air Conditioner Temperature Control Board
The temperature control board provides voltage to the fan motor and compressor. If the control board is defective, it may stop providing voltage to the compressor. Control boards are often misdiagnosed. Before replacing the temperature control board, make sure you check more commonly defective parts—particularly the compressor overload, capacitor and the compressor itself. If you are certain that all of the other components are working properly, replace the temperature control board.
Highly Likely
04 - Sharp Air Conditioner Compressor
The compressor itself might be defective. However, this is not usually the case. Before replacing the compressor, be sure to check more commonly defective components—particularly the overload protector and the compressor capacitor. If the compressor is defective, it should only be replaced by a licensed technician.
Highly Likely
05 - Sharp Air Conditioner Overload
The overload protects the compressor from burning out if it draws too much current. Over time, the overload can burn out. To determine if the overload is burned out, use a multimeter to test the overload for continuity. If the overload does not have continuity, replace it.
Highly Likely
06 - Sharp Air Conditioner Relay Board
The relay board provides voltage to many of the components of the air conditioner. If the board is defective, it can stop sending voltage to the compressor. Relay boards are often misdiagnosed; before replacing the board, make sure you check more commonly defective parts—particularly the overload protector, the compressor capacitor, and the compressor itself. If you are certain that all of the other components are working properly, replace the relay board.
Common
07 - Sharp Air Conditioner Thermistor
The thermistor is a sensor connected to the control board that detects the temperature of the outside air. If the thermistor does not have continuity, it can prevent the compressor from running. To determine if the thermistor is at fault, use a multimeter to test it for continuity. If the thermistor does not have continuity, replace it.
Common
Frequently Asked Questions
Why is my Sharp air conditioner compressor not turning on but the fan still runs?
Can a bad thermostat or thermistor cause my Sharp AC compressor not to start?
How do I test the overload or capacitor if my air conditioner compressor won't run?
Should I replace the control board if my Sharp air conditioner compressor is not working?
How do I find the right replacement part for a Sharp air conditioner compressor that won't run?