Question about Dometic Rooftop RV Air Conditioner

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Coleman rooftop a/c coachman travel trailer

I have a rooftop coleman a/c. the ran runs fine but the compressor(motor) continues to run even when i switch off the thermostat. the only way to cut it off is to flip the breaker... please advise

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It's likely that the contacts are stuck closed. You can usually just tap them with a screw driver and they will open but then you should replace them. If you don't know where they are. Find the power wires coming inside the unit and follow them. Contacts are fairly easy to replace as long as you do it wire for wire. In other words when you remove a wire from the old attach it to the new before removing another. I hope this helps. Please don't forget to give me a Fixya rating.

Posted on Feb 26, 2009

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Posted on Jan 02, 2017

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If you have to jiggle the wires going into the compressor motor to get it going, I would submit that you may very well have a broken wire or otherwise loose connection that is making contact when you jiggle the wires. If all appropriate connections were good, jiggling the wires would/should have no effect. I assume you are jiggling wires AT THE MOTOR input and not elsewhere in the circuitry. After you jiggle the wires and get it started, does it continue to run? or if not, describe more thoroughly what is happening..

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Neither.
The fan should run in the 'auto' position.
If it runs (on hi and lo settings) then I doubt if anything is wrong with the fan motor.
I would think your thermostat is bad and needs replacing.

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Your unit is pulling too much power which is popping the circuit breaker. Either the compressor motor or Fan motor has a problem and you need a pro here. Drawing excessive electrical current is not good and you can do even more damage to your unit by continuing to try and run it!

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The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of
tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.

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Dirty coils might be your problem. You might have a refrigerant problem as well. Try cleaning it first then have a tech put gages on it. Doesn't sound too serious

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I don't think you need a new one just a good cleaning and service. The unit has a liquid high temperature line near the compressor with a fan blowing outside air across it this coil gets clogged over time with air-borne dirt and pollen and leaves and such and must be cleaned regularly or the unit will be unable to remove the heat from the coil and during the peak demand (3pm) the circuits that protect the compressor and the trailer wiring from being overloaded and burning or melting will trip. From what you have described it sounds like the RV is working as it should with a condenser coil that needs to be cleaned. GL and happy camping!
P.S. I've only serviced the occasional RV unit but in those cases I laid a piece of plywood on top of the Rv for work platform removed the retaining screws from the top cover and used a spray bottle with a good heavy foaming cleaner a shop-vac and a brush to get the job done.

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