Central air unit shuts off each day for several hours, regardless of temp and thermostat setting

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Central air unit shuts off each day for several hours, regardless of temp and thermostat setting

by Nora
(Oklahoma)

Why is my central air conditioner unit shutting off each evening? It cuts off and will not restart until late at night, when the outside temp cools down - with no changes to the thermostat.

The electronics portion of the AC is located in our attic. We thought that it may be overheating, so installed a temperature activated attic fan. This did not help.

The central ac unit works great during the morning and mid afternoon while it is running. Just can't figure out what is making it short-out(?) and shut off each evening.

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Central air unit shuts off each day for several hours, regardless of temp and thermostat setting

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Compressor Shuts Down
by: Dadan

The compressor has a low pressure switch or internal safety switch. It would shuts off to protect the compressor from damage.

Had you have maintenance done on your central heating and air conditioning unit? It best to have local hvac tech look at it.

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Outside Unit shuts down and then turns back on
by: Anonymous

What if it is the outside unit that shuts down about the same time every night, thermostat continues to blow air. Then later in the evening the outside unit comes back on and blows cold air?

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Comment to NG
by: Anonymous

You are absolutely right. The overflow pan was filling up too much and causing the shut off switch to trigger. AC repairman said it would be quite expensive for him to fix the drainage issue. We've tried clearing the drain pipe ourselves - with minimal to moderate success and have now resorted to keeping an eye on it and using the shop vac when needed.
Thanks for the input!

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To protect your ceiling
by: Ng

Without enough information. But let me suggest that the drain from the evaporator coil pan located in your attic may be plugged up. This unit set up should have a water overflow detection to shut down the operation of the AC before water run down your ceiling. Try to find and clear the drain hose from this unit and you may solve the problem.

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Central Ac Unit Shut Off
by: Dadan

When you said the central air conditioner shut off each evening. Is it the outdoor shut off or both indoor and outdoor unit shut off?

If the outdoor unit shut off. Does the outdoor fan run and not the compressor?

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Central air unit shuts off each day for several hours, regardless of temp and thermostat setting

Comments for Central air unit shuts off each day for several hours, regardless of temp and thermostat setting

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Central air unit shuts off each day for several hours, regardless of temp and thermostat setting