Question about Dometic Rooftop RV Air Conditioner

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HELP??? Ok, I have a brand new 2014 Palomino Sabre fifth wheel. I have had it for approx 4 weeks now. It has 1 13,500 BTU ac unit & 1 15,000 BTU ac unt. They both keep tripping the inside breakers. Note: On both the units the fan will shut off at random times while the compressor keeps running for approx 5 sec the the fan kicks back on. I bought a volt meter tht plugs into a regular wall outlet and the voltage seems to be fine. I checked the wire connections in the units and everything looks perfect. Any ideas would be really appreciated.

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  • Spence Doucet
    Spence Doucet May 12, 2014

    I think i may have found one of the problems. the 13,500btu was on a 15A breaker & i found a manual for the unit & it said it needs to be on a 20A. So i did just tht and no problems so far..

  • wa2yyx May 12, 2014

    That is why I asked you to check on the circuit breaker. 20 amps is what you should have with either a 13.5k or 15k unit. Glad I was able to help.

  • wa2yyx May 12, 2014

    That is why I asked you to check on the circuit breaker. 20 amps is what you should have with either a 13.5k or 15k unit. Glad I was able to help.


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Please take this unit to a certified tech. Having issues with both units at the same time is extremely rare. You either have "bad or low voltage" remember that the acs are 110 volt but the controls are 12 volt so make sure you have above 11 volts at the fuse panel for the thermostat at act properly.

Posted on Sep 02, 2014

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Are you plugging into the correct outlet? These units probabaly can't run off your home power, you need the 50 amp service that is provided at a campground. Most home outlets aren't capable of supplying this. Check this out first.


Posted on May 12, 2014

Testimonial: "I am plugged into 50Amp shore power"

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Hi Spence. because the unit is new and both A/Cs are tripping the breakers, you may want to check your power supply cord, if you are using an extension cord make sure it is a 12 guage and as short as possible. also check the size of the breakers that are tripping with the unit manual, possible they put the wrong breakers in when it was built.

Hope that takes care of it

Posted on May 11, 2014

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What was the voltage that you measured? Are the units 220 volt or 120 volt. Units that size are usually fed by 220 volts. What is the current rateing of the circuit breakers? Are they a double breaker with a handeling capacity of 20 amps or are they 15 amps.

You didn't mention if they ever worked? Are you feeding 120 volts or 220 volts to the two units?

Good luck,


Posted on May 11, 2014

Testimonial: "Im not sure the volts. the 15,000 BTU is on a 20A breaker & the 13,500 btu is on a 15A."

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: compressor on ac unit

we have the same problem but it wont dupicate when take it in to be checked replaced lower board but didnot help

Posted on Jul 16, 2008

  • 8220 Answers

SOURCE: Ac Problems

You must have too many things running on that circuit. Check your connection to the power box.Loose connection on the receptacle can cause the breaker to trip or too many things running on the same circuit. If the breaker is old it might need to be replaced.

Posted on May 10, 2009

  • 166 Answers

SOURCE: keeps tripping breaker when running ac

you need to check that the breaker it rated high enough for the ac unit

Posted on Jun 04, 2009

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SOURCE: RV air conditioner. Compressor running, fan stops before cool

The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.

Posted on Jun 09, 2009

  • 704 Answers

SOURCE: RV Air Conditioner Keeps Tripping Circuit Breaker & Compressor

It sounds like the unit was miswired at the factory, since when the A/C is "off" at the thermostat, there should be no calls for cooling or for the fan to run.

You also stated the most puzzling issue, with the breaker turned "off" the same thing happens. This shouldn't happen at all, when the power breaker is turned off, there should be no power being supplied to the unit and it shouldn't be able to do anything. Very strange indeed, but likely a major error done when the RV was manufactured, or some wiring in the loom has somehow become shorted and is supplying power from another breaker/source.

I think a call to the manufacturer is in order since there is no easy solution aside from possibly rewiring the A/C circuit.

Not sure when your RV was made, but definately time to call the manufacturer and break out the wiring schematic in an attempt to isolate and resolve the problem.

Hope you find this helpful and best regards!

Posted on Aug 06, 2009

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