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Most likely, it is a stuck contactor or relay that controls the compressor motor. If the compressor continues to run after the blower inside the house has shut off, the only way to stop it is to kill the power, either at a dedicated switch or sub-panel for the air conditioning, or at your main breaker panel. Turn off the power to the air conditioning and furnace system until you can have the unit serviced.

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Q: What is wrong if the compressor will not cut off in a central air?
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What is the function of compressor governor?

It puts the compressor into an unload state once cut out pressure is reached, and back into a loaded state once the cut in pressure is reached. Depending on the exact setup, a line from one of your air tanks will go to your governor. When the cut out pressure (between 120 and 135 psi) is reached, a valve opens in the governor to send air to to compressor and to the air drier. This closes the discharge valve on the compressor, sending it into an unloaded state, and also starts the air drier purge cycle.


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