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Old 06-04-2016, 04:52 PM   #1
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Ac Compressor won't shut off

I have a 13500 btu AC the fan shuts off but the compressor continues to hum until you trip the breaker. Was working fine all week but was on a lot because it was very hot out last week. Looking for input on why and how to fix.
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Old 06-04-2016, 08:42 PM   #2
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Will it restart 5 min later when you click breaker back on or does it start to hum again? If it does nothing then lower the stat and tell us what happens.
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Old 06-04-2016, 09:01 PM   #3
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Sounds like a bad thermostat.
There was a thread describing the same symptoms a while back and it turned out to be a bad t-stat.
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Old 06-04-2016, 10:31 PM   #4
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Boon it starts humming right away even a day later.
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Old 06-04-2016, 10:33 PM   #5
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Going to check tstat first then go on from there saw something about a relay welding itself shut causing this also will be cking that too
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Old 06-04-2016, 10:55 PM   #6
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In a previous trailer, I had a compressor that wouldn't shut down unless I flipped off its breaker. I read about a test wherein the yellow wire should be pulled from the thermostat. The article said if the compressor kept running after the yellow wire was pulled from the thermostat, the control board in the A/C unit was bad. I took it to the service dept. of my selling dealership and the service manager said, "Yeah, right" as if a customer could not possibly know. They called Dometic who told them to run the test I suggested. It failed. Dometic sent a new control board and paid for its installation.
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Old 06-04-2016, 10:56 PM   #7
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Try to find a manual for your thermostat with a Google search.

1. Disconnect the compressor control wire (often yellow) at the thermostat and see if the compressor shuts off. If it does.............

2. Test the voltage at the compressor control wire terminal and see if it is still activated when the thermostat no longer calls for cooling. If so, bad thermostat.

Edit: Dan beat me by a minute.
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Old 06-05-2016, 12:38 AM   #8
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If the compressor just hums and does not start which you would be able to hear, the start capacitor is more than likely no good.

Grab yourself one of these to replace the old capacitor and you should be good to go.

The hum you are hearing is the motors windings. The start capacitor gives a boost of amperage to the windings to get the armature turning. Without that amp boost the armature can not start to turn so the motor sits there and hums.
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Old 06-05-2016, 01:31 AM   #9
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Saying that it starts right away even a day later leads me to believe it's the control board. If it was the thermostat, the compressor would not start right away after power is turned back on do to the built in time delay on the board.You could probably smack the relay on the board with thermostat turned off and the compressor may turn off and run normal, but it would probably stick again after running for a while.
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Old 06-05-2016, 01:38 AM   #10
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Quote:
Originally Posted by bob dirt View Post
Saying that it starts right away even a day later leads me to believe it's the control board.
OP says it hums, but does not start.
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