Question about Dometic Rooftop RV Air Conditioner

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Compressor makes a humming noise

I turn the unit on and when the compressor tries to come on it makes a humming noise then cycles off and problem repeats itself? starting capacitor or compressor?

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Posted on Jul 25, 2008

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If you have an Amp meter available to you, you can check the electrical draw of the compressor. Compressor may have a tag that gives a rating for LRA which is locked rotor amperage. If the draw is within 2/3 of LRA check the compressor relay and or capacitor. If your reading is equal or near LRA the compressor is done. The hum you hear is power to the compressor. When it is cycling off it is the overload protector opening cutting off the power due to an electrical overdraw. Hope this helps.

Posted on Jul 24, 2008

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Posted on Jul 24, 2008

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Good guess! Without hearing it myself it is hard to say for sure. Be aware that there are many things that can cause the capacitor and compressor to fail. So the problem may be bigger then just the symptoms that you see/hear. Please call a licensed technician to take a look.

Posted on Jun 17, 2008

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