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Air Conditioner Compressor Won't Turn Off

The 7 most common part(s) or condition(s) which cause the symptom Air conditioner compressor won't turn off are listed below starting with the most likely. Check or test each item and watch any available videos.


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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.

To see parts for your air conditioner, you need to enter your model number on the right. The system will then display parts that are associated with your air conditioner.

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.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your air conditioner, you need to enter your model number on the right. The system will then display parts that are associated with your air conditioner.

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.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your air conditioner, you need to enter your model number on the right. The system will then display parts that are associated with your air conditioner.

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.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your air conditioner, you need to enter your model number on the right. The system will then display parts that are associated with your air conditioner.

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.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your air conditioner, you need to enter your model number on the right. The system will then display parts that are associated with your air conditioner.

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.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your air conditioner, you need to enter your model number on the right. The system will then display parts that are associated with your air conditioner.

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.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

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