Question about Dometic Rooftop RV Air Conditioner

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Compressor tries to start but want

Duo-Therm- Dometic roof unit. The fan runs fine but when you click thermostat to engage the compressor it tries to start or surges and within 3 seconds it clicks off. Have tried replacing the two capacitors with no difference. Any idea why the compressor want start up.

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  • buttercat52 Aug 21, 2008

    It can't be that simple but you can bet we will try tommorrow. Thanks

  • buttercat52 Aug 22, 2008

    try connecting directly and when I flip the switch to engage the compressor it immediately flips the breaker. Do you think it is either of the two capicitors or does compressors short out. I'm lost tried installing the two new capcitors but was still using a extension cord. Return the capcitors back to company I ordered before I tried connecting directly to power source like a idiot.

  • nellybell12 Jan 15, 2009

    the fan runs fine the compress comes on but then shutes off.

  • Mike Butler
    Mike Butler May 11, 2010

    Has the actual voltage to the AC unit been checked ? If it's posted somewhere I missed it sorry.

  • Anonymous Mar 28, 2014

    Fan not starting by itself Will run when helpt along by hand

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  • 417 Answers

Hi,
you have to run a contractor grade extension cord(10-12 gauge) from your rv to run those or theyll do that, the lower the gauge the better, best bet is to plug the rv directly into the outlet, if you cant, get the shortest and thickest extension cord you can.

Posted on Aug 21, 2008

  • Jude Meredith
    Jude Meredith Aug 22, 2008

    hi,



    how many amps is that breaker thats tripping? it has to be 25 or 30 amps or it will trip. hook the old wiring and capacitors up the way it was and hook it to a higher amperage breaker circuit in the house. also look closely for a decal which shows the voltage for the unit, it may be that the air conditioner is 220 volts, but most likely the compressor is shot, if they sit for a long time they freeze up and wont run. mabe take the air conditioner off and call some used appliance stores and maybe take it to them for a repair. your not an idiot, the only way to learn is from your mistakes.

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