Question about Dometic Rooftop RV Air Conditioner

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My a/c comes on fine; however, if the fan is on low it kicks the circuit breaker after a couple minutes. It works fine on high.

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My RV Pro A/C units kick a breaker if the thermsistor in inserted into the coils but runs OK if i take it out of the coils.

Posted on Aug 20, 2010

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Feel the compressor it may be getting hot and the increased
air flow on high may cool it somewhat.
If so compressor problem or much slowed fan
Check air volume on low.
If this was helpful please rate me.
Leo Ponder Appliance-Tyler,Texas
imufo2@sbcglobal.net

Posted on Aug 06, 2010

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1 Answer

Ac works fine when fan is on low but fan cuts off after a couple of minutes on high


Bad fan motor. Multi-speed motors have a set of windings for each speed. Your high speed is bad so the only solution is to replace the complete motor. When motors are going bad they will over heat and kick out on the heat safety. As it cools back down it will start again for a short time again until it gets hot again.

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Hello, I have a duo therm ac unit, the fan works fine in all the Fan only speeds, but when the ac is selected, the compressor comes on and the fan drops down to less than half speed. you can hear the fan...


Check incoming voltage circuit and wiring for proper gauge wire etc, and have compressor start capacitor tested, or replaced. I'm curious as to why circuit breaker didn't trip in panel when compressor causing so much current draw, that's reason for checking wiring etc to AC circuit.

Sep 14, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Its been working great and now for the last two days it works fine the compresser kicks on but when it kicks off and trys to come back on it pops the electric breaker. its been working fine on the same...


Whether its a central air unit or a wall unit, make sure the condensor is clean and air can flow thru it
make sure the condensor fan is running, the condensor fan keeps the compressor from over heating
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It worked fine last year. This year it throws the breaker on the gen. After 2 or 3 min. The fan works on low and high but it trips on low or high ac its a model 6759c707


If all is the same as when it ran good, such as same power cord (no extension, or properly sized extension ) same generator output voltage etc, then I'd check amp draw when compressor kicks in. Good chance compressor start capacitor may be faulty.

Jun 26, 2010 | Dometic Rooftop RV Air Conditioner

3 Answers

Fan works, but if A/C turned on, trips breaker within a few minut


You need to verify if the problem is the unit or the breaker.  To do this, you will need to measure the current it is pulling from the power source.
If the unit is pulling too much current, then the unit is the problem.  If the unit is pulling as much or less than its rated current draw, then the circuit breaker is worn out.
The units WILL pull more power when hot outside.  It should not trip a breaker unless something is wrong with either the unit or the breaker.
A current draw test will tell you for sure.
If it's not the breaker, then it's probably low refigerant causing the issue.

Jul 08, 2009 | Dometic Rooftop RV Air Conditioner

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