Question about Dometic Rooftop RV Air Conditioner

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I have a rv a/c unit that the t stat cycles faster than the compreesor doesnt have time to equalize then overloads and trips the breaker. does dou therm make a t stat that has a programmable sort cycle delay or something that could help?

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  • panilling9
    panilling9 May 11, 2010

    not sure on the thermostat

    be sure your air flow is not blowing on the thermostat

    be sure there is not a heat source near the stat light bulb etc:

    sometimes the cooling anticipator goes bad in the thermostats causing short cycle



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Bad news is I doubt it is your thermostat
Sounds like a compressor problem to my 15 years of experience

Posted on Mar 06, 2010


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I have a Dometic 640315 that was installed by rv manufacter on breaker 15 amps. When i try to used it the breaker goes off.

I believe it is supposed to have a 15. Remember, breakers are installed TO PROTECT THE WIRE, NOT THE EQUIPMENT. If a breaker is tripping you just don't put a bigger breaker. The wire must be the correct size for the breaker. Take it to the manufacture.

If you need further help, reach me via phone at

Jul 08, 2017 | Dometic Heating & Cooling

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Circuit breaker switch to rv water heater blew and will not reset. Was working until I overloaded the unit's 30 amp service. Reset GDIF switch and replaced water heater element, per RV tech's advice.

if you have overloaded the system , it is possible that at some point the insulation has broken down and there is current leakage that is tripping the rcd unit
the current can be in milliamps so best get in an electrician to check the entire system on that breaker

Jun 01, 2016 | Heating & Cooling

1 Answer

My duo therm 13.5 btu rv air conditioner started making a popping sound and dimming the lights like it's trying to cycle to shut off. Well then it started triping the circuit breaker so I changed out the 2...

The best guess is that you have a bad thermostat. When the compressor shuts off it has to stay off for a long enough period of time for the low pressure high pressure to equalize. If it turns the compressor off and back on immediately it can't start against the heavy load created by these unequal pressures. If it will start every time after sitting for 10 minutes the thermostat is making it short cycle.

May 26, 2014 | Dometic Rooftop RV Air Conditioner

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Main breaker doesnt stay turned on

Tripping of the main breaker could be an indication of a short or an overload. To check for an overload you will need an amprobe to test the amperage load on the breaker. Turn all the secondary breakers off. Attach the amprobe by clamping it around one power wire. Turn the breakers on one at a time and check the reading of the amprobe. Most breakers will handle about 80 % of the breaker rating before tripping. If it trips below this point the breaker may be weak and will need to be replaced. If the amprobe pegs out at any time and the breaker trips the secondary breaker that was last turned on probably has a short in its wiring somewhere. Cuasing the breaker to trip. Underground wirng that has gone bad can sometimes take a while to trip the breakers so if there is any underground feeders it may be more difficult to track down a short. If the problem is an overload check both hot wire to see if the load is equal if the load is a lot higher on one leg than the other switching some circuits to the lower side may help. If the total load is just too high you may have to increase your service to a larger size. Hope -this helps

Nov 04, 2011 | Cutler Hammer 100 Amp Main Breaker...

1 Answer

Breaker breaks

This unit may have an internal overload mounted on top of the compressor. You would have to get to the
compressor to find out and it maybe faulty. That may
explain why the compressor comes on later on, this
overload protects the compressor from getting hot.

When you trip the breaker and then reset it again only to see it trip again almost sounds like a direct short or loose wire. It could also mean that your
capacitor needs to be replaced or that you need a hard start kit and the unit needs a good cleaning.

Try just operating the fan and see if it trips the breaker, if it does then either the blower motor is bad
or it is still the capacitor.

Jun 25, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Suspect that a 15amp heater tripped the 15amp breaker. this happened a couple of times. now when the 15amp breaker trips a 20amp breaker also trips. the heater is now unplugged and the 20amp can be reset...

You Know for a 15AMP unit it really should be on it's OWN sub-main, Ordinary House sockets are usually only 10AMP rated. This WILL overload any normal household wiring. You also need to get this unit checked out. to see if you have any "Earth leakage". Also at 115volts and 15Amps that equal a 7.66 OHM load....Be careful.

Feb 03, 2010 | Heating & Cooling

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Penguin 13500 ac short cycling


Jul 31, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

AC Runs for about 10 minute then trips breaker

is your breaker is ok or lose concation is good.if this both is good than cheek his overload.

Jul 20, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Heat stripe and compressor on at the same time

Is this a wall mount thermostat or manual control unit? What is the model of the air conditioner? The only way that this is going to happen is that power is jumping somewhere to the heater coil from the cool side.

If it is a wall mount thermostat, the yellow wire is the cool mode (compressor on) and both the tan and blue wires are the fan mode. The orange wire is for the heat strip. So if you set the thermostat on High/Cool, then you should have power at the yellow and blue wires, not the orange. If the orange wire is energized, then there is a problem.

Remove the orange wire from the thermostat, try it again. If the breaker trips, then remove the wire from the connection at the relay board. Once again, try the unit. If the breaker trips due to the same problem, then it has to be a bad relay board. If the breaker does not trip this time, then you have problem with your wiring between your thermostat and the control unit.

Sounds like you don't have manual controls since it has a relay board.

Hope this helps,


Jul 02, 2009 | Dometic Rooftop RV Air Conditioner

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