Question about Dometic Rooftop RV Air Conditioner

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When the AC fan shuts off, the compressor appears to be stuck. It continues to make a humming sound as though it is running. If I remove power and return power it hums momentarily and then shuts off. Is it OK to allow it to "hum"? I constantly kill the power when the fan shuts off in fear of harming the motor or compressor.

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  • Dometic Master
  • 6,674 Answers

Yes, not good for compressor to stay on after being shut off, and hitting the breaker to stop it is a good idea. Sounds like you have a faulty/sticky relay. Not an expensive part, and shouldn't take any longer than 1/2 hr to change. Have a technician, or electrician look at it and give them a model number of unit so they can make sure they have a relay with them when they come. That way, another trip back, as well as a service charge will be eliminated. You have capacitors in the same area, that are very dangerous to work around if not experienced, so make sure the person is experienced, to avoid shock from 250-370 volts stored in those capacitors.

Posted on Aug 07, 2010

  • vaniec7 Apr 20, 2011

    Mine just started doing this very thing. Humming even if the ac thermostat is in the off position. It only stops when I turn off the 20 amp main. My question is, how long can you leave the main off, while using the 30 amp main to run coffee pot, microwave, etc.?
    Thanks for the above advice..and any that follows..

  • Mike Butler
    Mike Butler Apr 21, 2011

    Your 20A circuit in breaker panel should only be running the AC. It shouldn't affect anything else in the RV, unless someone has added a receptacle or light or something else, but normally from factory, it will be on it's own circuit. By all means, leave it in the off position. Be aware that depending on the year,model, serial number, and thermostat used, the relay for that can be in a control box at ceiling assy.,as well, but relay in some cases is not the problem, but thermostat, wiring etc., will need to be checked as well for proper diagnosis.

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