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Old 04-08-2022, 10:03 PM   #1
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Join Date: Apr 2022
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Dometic AC Turns on randomly

We had an issue where the AC wouldn't shut off when you change the thermostat to off. We where told we needed to change out the thermostat and all the relays, etc that go it. We bought a kit for $162 and changed everything to new.
The AC worked fine for about 6 hours. We turned the thermostat to off and opened all our windows and about 3 hours after that the AC just turned on and started blowing. The only way for us to get it to shut down was to cut power to the entire camper. It was not set to auto, we never use auto but we did double check and the thermostat was set to off.

Any thoughts on what is wrong? Could the kit we bought be bad too? We bought it from a RV repair company and it was new.

Thank you!
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Old 04-09-2022, 12:06 AM   #2
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The two wires that go from the thermostat to the AC control are shorting together somewhere. They may be running over a metal edge, shorted by a screw or staple, or stripped bare somewhere.

You could temporarily run a pair of wires externally from the thermostat to the AC control to verify this.

Turn the circuit breaker off until you find the short to disable the AC.
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Old 04-09-2022, 04:30 AM   #3
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Quote:
Originally Posted by Johnfort View Post
Turn the circuit breaker off until you find the short to disable the AC.
x2

Always start by turning off circuit breakers or pulling fuses as applicable. Then you have time to relax while working out a plan of action.
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Old 04-09-2022, 09:06 AM   #4
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Ok Thank you Johnfort. We will check that.
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