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RV rooftop A/C trips breaker after awhile

I have an amp meter and put that on the incoming power line. Book says it should use about13.2 amps but it was using up at about 16 amps. Then I put it on lo cool and it started to climb above 17 amps but stablized. It is 19 years old so I am wondering if it is on its way burning out.

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Try removing the wires to the compressor and see what it draws when just the condenser fan is running. The motor for that fan should have an amp rating for it. If the fan is not running as fast as it should it will bog down the compressor.

Posted on Aug 02, 2009

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What causes an ac unit to pull too many amps and then pops the breaker


A few things to check . Incoming voltage, unit is clean and not overworking due to debris/dirt in evaporator and condenser coils. If it trips the breaker when compressor kicking in it may be a faulty compressor start capacitor. When does it appear to happen most times?

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Duo therm mod. 57915 air conditioner seems to work good , runs for 4-5 minutes then kicks breaker , was kicking 30 amp breaker at camp ground , i've been working on connections to make sure its...


Unit may pull as much as 17-18amps when compressor starts up, but level out to 12-15 amps when up and running. Keeping in mind that is all relative to proper 120v incoming voltage, heavy enough wire to run the application etc. If your AC unit needs cleaning , it may draw an extra amp or 2 . With that said, when your at the park, first thing I'd question is their incoming voltage to RV, and try running fridge etc and anything else on propane if possible. The AC alone should not cause 30amp at source breaker to trip, before 15 0r 20 amp breaker in RV that is connected to AC trips. If it doesn't trip your breaker at home, and all is connected same at park, then I certainly would suspect bad breaker or voltage/wiring at park is the cause. P.S. I noticed you said you have 12 gauge wire (rated at 20 amps) connected to a 20amp breaker at panel, but RV is plugged in to a 15amp receptacle, I will assume with a 15 amp adapter from 30 amp plug. Do you see any hazard regarding 15 amp rating on receptacle? ( just a little advice.)

Aug 15, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Compressor runs for only a moment the circuit breaker trips


Lights dim, moaning from AC, just before it trips breaker? Have you checked incoming voltage? What type of plug are you hooked up to, 30, or 50 amp?

Aug 30, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

AC runs for 5 minutes and then circuit breaker


What else do you have running on hydro while AC is running? Such as coffee maker, microwave, water heater, fridge. That 30 amp breaker is your main breaker I assume, or breaker on pole your plugged in to. Keep in mind your AC will normally draw approx. 15-17+ amps momentarily when compressor kicks in to cool, then drop back to 12-15 amps when running normal. If your AC is drawing too much current, then you would only normally trip 20 amp breaker for AC in your panel. Try switching other appliances to gas operation while running AC, such as water heater, and fridge. Make sure incoming voltage is up to specs as well . (115-120 volts)
If water heater takes 5-8 amps, and fridge takes same when they are calling for power, you'll be close or over the 20amp mark when you consider your on board converter etc. as well. That only leaves approx 10 amps for AC that requires approx 15 amps to run, and up to 20amps when compressor kicks in. If you switch all those other items over to propane, and it still happens, then a current draw test should be done on AC unit to see if perhaps a capacitor is faulty, or possible compressor faulty.

Jul 22, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

My unit was working fine until 3 days ago when the breaker tripped, I reset the breaker and worked fine for a day then tripped again when it tripped both the ac breaker andthe main in the trailer as well...


High amp draw can be caused by a few different things, so first check that incoming voltage to trailer is sufficient. (115 volts) Not unusual for some parks to install more hydro hook-ups on a feed line, and when all are up and running, your incoming voltage could be decreased. If your o.k. that way, then I'd start looking at the compressor circuit of your ac, in particular, the compressor start-up capacitor. The capacitor basically stores electricity and boosts it to higher voltage for compressor and fan start-ups to reduce current draw that will trip the breaker. Please have a knowledgeable electrician, or RV tech check this for you, as a capacitor can give a real good high voltage (possible fatal) shock, even when power is off to unit. I also suspect that the start relay has shorted (welded) itself due to high amp draw situation, and that is reason it comes on by itself.

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You need to borrow a clamp on style amp gauge, and check amp draw on black wire in box where hydro wires connect. (PLEASE, be careful, and if not experienced in this type of test, don't try it, due to likelihood of getting a shock. ) If it's the compressor kicking in that's causing the breaker to trip, and capacitor is good, then it's usually a problem with either low incoming (supply) 110-120 AC voltage, which will cause high amperage draw, or compressor on it's way out causing high amp draw. If it's only drawing 15-18 amps, and your tripping a 20 amp breaker, then breaker is getting weak.

May 18, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

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!

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Possible overcharge or bad breaker. You need to check the amp draw for the unit. If you draw under full load amps and trips breaker breaker is bad.Rus

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1 Answer

Roof Top A/C Throwing Main Breaker


do you have an amp meter. when the main is tripped what is running? maybe the main breaker is going bad. I dont think you are pulling more than 20 amps when everything is running. not unless the fan on the A/C shorts to ground when it gets hot????

let me know

Jun 22, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Coleman RV Rooftop Air conditioner


If the compressor is tripping the breaker, then its 1 of 2 things. First clean the coils and change the air filter. If the coils are dirty and/or the filter is clogged, it will make the compressor overload and the high amp draw will make the breaker trip. If this doesn't solve the problem, you need to check the compressor itself. remove the connections at the compressor, leaving only 3 posts on it. You will need a meter to check for continuity to all 3. They should all have continuity to each other. While there check the wires. Sometimes a burnt wire will come off and arc on something causing the breaker to trip, if you are lucky.

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