Question about Dometic Rooftop RV Air Conditioner

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Mach 3 RV a/c problem

Turned on RV air conditioner, unit works until temperature is reached, when air temp is raised in RV and a/c unit tries to restart, it trips the breaker.

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I'm having the same problem tried a new thermostat and cleaning unit inside and out and still the same results. Seems like a control board not working.

Posted on Aug 20, 2008

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Posted on Jan 02, 2017

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I don't think you need a new one just a good cleaning and service. The unit has a liquid high temperature line near the compressor with a fan blowing outside air across it this coil gets clogged over time with air-borne dirt and pollen and leaves and such and must be cleaned regularly or the unit will be unable to remove the heat from the coil and during the peak demand (3pm) the circuits that protect the compressor and the trailer wiring from being overloaded and burning or melting will trip. From what you have described it sounds like the RV is working as it should with a condenser coil that needs to be cleaned. GL and happy camping!
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