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Air Conditioner Compressor Won't Turn Off

The 7 most common part(s) or condition(s) which contribute to the symptom Air conditioner compressor won't turn off are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.


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For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.

Other Causes and Conditions

Condenser Coils are Dirty

If the air conditioner compressor runs continuously and won't turn off the condenser coils may be dirty. The condenser is like a radiator and must stay clean in order to dissipate the heat which was removed from the air. As the coils get dirtier the air conditioner becomes less efficient, which makes it work harder to cool the room. If the coils are dirty enough, the unit will never be able to cool the room and so it won't turn off.

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Temperature Control Thermostat

If the air conditioner compressor runs all the time the temperature control thermostat might be defective. The temperature control thermostat provides the voltage to the fan motor and compressor. Over time the contacts inside the thermostat can burn out.

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Thermostat

If the air conditioner compressor runs all the time the thermostat might be defective. The thermostat is a sensor which detects the room air temperature and a switch to provide power to the fan and compressor. If the thermostat is defective the air conditioner compressor might run continuously.

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Thermistor

If the air conditioner compressor runs all the time the thermistor might be defective. The thermistor is a sensor which detects the room air temperature. It is connected to the control board. If the thermistor is defective it will not have continuity when it should. If this happens the compressor runs all the time.

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Relay Board

If the air conditioner compressor runs all the time the relay board might be defective. The relay board provides the voltage to the fan motor and compressor. These boards are often misdiagnosed. Check all other components to be certain this is the cause of the problem.

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Temperature Control Board

If the air conditioner compressor runs all the time the temperature control board might be defective. The temperature control board provides the voltage to the fan motor and compressor. These boards are often misdiagnosed. Check all other components to be certain this is the cause of the problem.

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Main Control Board

If the air conditioner compressor runs all the time the main control board might be defective. The main control board provides the voltage to the fan motor and compressor. These boards are often misdiagnosed. Check all other components to be certain this is the cause of the problem.

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