Question about Dometic Rooftop RV Air Conditioner

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Compressor is blowing breaker, fan comes on. Ac worked fine last season. when trying to go to any cool setting, compressor will actually stall generator, or trip breaker if attached to house

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You have a faulty start capacitor. The capicitor helps start the motor ... since it is not doing its job, the motor draws LOTS more power from the line popping the breaker. Have your professional RV service center service your AC.

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Posted on Jul 05, 2010

Testimonial: "I am a technical Instructor for a major import, so I know my way around HVAC. so glad to have someone who can pin point the problem I found that the motor start fuse on top of the capacitor is melted. it still has some continuity, but looks like your diagnosis will fix it."

  • A Miller Jul 28, 2010

    Thanks for the education, the 4 thumbs up. I am happy to hear you are on your way to getting this AC going.



    /s/ me ... just a guy with a little bit of a/c knowledge

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  • Master
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Hi, just some food for thought, it is a run capacitor, not a start. The capacitor has a resister across it that has over heated. The first thing to check would be the capacitor, but if the compressor is drawing enough amperage to kill the generator, I would also mega ohm the compressor windings as this may also cause this problem. Some older compressors had the start capacitor, then they added a run so the start would drop out when the compressor got up to speed. Now, they did away with most all start capacitors except on refrigeration equip. They use both single and dual capacitors on a/c units. Good answer though.
Sincerely,
Shastalaker7
A/C, Heating, and Refrigeration Contractor

Posted on Jul 10, 2010

  • Robert Horton
    Robert Horton Jul 12, 2010

    Thank you for the great rating, please look me up if you need any more information.
    Sincerely,
    Shastalaker7, A/C, Heating, & Refrigeration Contractor


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