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Central Air Does Not Cool At All

The 5 most common part(s) or condition(s) which cause the symptom Central Air Does Not Cool At All are listed below starting with the most likely. Check or test each item and watch any available videos.


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

Contactor

If the central air condensing unit outside does not run at all the contactor might have failed. The contactor receives a low voltage signal from the furnace control board to turn on. When the low voltage signal is received by the contactor it should close sending the main voltage to the condensing unit components such as the condenser fan motor and compressor. The contactor can be physically checked for burn marks indicating it's failure or a multi meter can be used to check the contactor electrically.

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Other Causes and Conditions

Incoming Power Problem

When the central air conditioner condensing unit contactor is energized it allows 240 volts to flow through a nearby disconnect box to the compressor and condenser fan motor. The disconnect box which provides a way to turn off power to the condensing unit outside includes a cartridge which may contain fuses. If the compressor and condenser fan motor do not run the disconnect box fuses might be blown or the circuit breaker supplying power to the disconnect box may be tripped. The fuses can be tested for continuity to determine if they have failed.

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

Run Capacitor

If the central air conditioner does not cool at all the run capacitor for the fan motor might be bad. If the run capacitor is bad or not rated properly for the motor it may not run at all, be noisy or overheat. A easy way to tell if the run capacitor has failed is to visually inspect it for signs of bulging or leaking.

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

Condenser Fan Motor

If the central air conditioner does not cool at all the condenser fan motor motor might be bad. The incoming voltage to the motor can be tested with a multi meter. If the motor is receiving the correct voltage but not running it or the capacitor for the motor are likely bad.

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

Capacitor

If the central air conditioner does not cool at all the run capacitor for the fan motor might be bad. If the run capacitor is bad or not rated properly for the motor it may not run at all, be noisy or overheat. A easy way to tell if the capacitor has failed is to visually inspect it for signs of bulging or leaking.

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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