Question about Dometic Rooftop RV Air Conditioner

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13500 dometic ac for rv with anilog thermostat

This ac works perfectlly fine intel you shut the thermostat down there should be no power to the unit but the compressor comes on and of can any one tell me what is causing this bad theremostat or it is the upper unit control thanks

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  • loflaw Mar 08, 2009

    On my Dometic AC the compressor is only off if turn off the circuit. If the circuit is on the compressor runs, regardless of where I set the thermostat; furnace even and it runs until it trips the circuit. Do I need a new thermostate, it's going to get hot soon?

  • dva1101 Mar 13, 2009

    I have same exact problem. Ac works just fine, except the compressor will not shut off. Only way to shut off compressor is to trip the circuit breaker. I have replaced the board twice now. RV repair said converter bad, replace that also, no change. Wonder if maybe starter unit is stuck somehow? Cannot find anyone who can give an answer to that question. Spent about 400 so far and no better off, probably should have just bought new air cond.

  • Jerry Shannon May 11, 2010

    How new are these units? If the thermister fell out of the evaporator the may not shut down. Are you sure the compressor in running and not the fan? 3 issues come to mind. Thermister, control board, wall thermostat.

  • Farley Redfield
    Farley Redfield May 11, 2010

    If I can see or ask questions about the wireing I can help you figure out the next step. 

    1st what voltage is the thermostat 110 , 24 , other? And where is the thermostat located on the WALL, or on the unit close to the roof?



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My Unit is only about 5 years old; but it's working great now. I spoke to a man at an RV service department, he suggest replacing the thermostate and Jay box, which is the box inside my roof unit, accessable when I remove the filter. When I replaced the thermostate nothing changed, but the Jay box did the trick. The Jay Box came with a new thermostate anyway, and cost around $80. Good Luck

Posted on Mar 23, 2009


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