Question about Dometic Rooftop RV Air Conditioner

1 Answer

Portable generator pops breaker when temp is over 75 degrees

Duo-Therm RV Roof top A/CI recently bought a portable generator to power my A/C unit in my 2007 Four Winds 26L Trailer.When the temperature is higher than say 75 degrees outside it kicks off the breaker on my generator. the generator is 3500 watts cont. and 4400 watts surge.Can you tell me what is wrong

Posted by on

  • 1 more comment 
  • jo_don2 Jul 20, 2009

    yes Rv plugged in. it has a 25' 30 amp cord.
    the plug says 30 amp on the generator I don't have any idea what the breaker size is. it does not say.

  • jo_don2 Jul 20, 2009

    i have turned everything to propane and the only thing is the A/C running.
    the generator can start it and run but only for a few moments but when the temp drops it works flaulesly.

    the A/C unit is a Duo-Therm by Dometics. I was wondering if it is low on freon if that would make it drew harder.

  • jo_don2 Jul 20, 2009

    yes. the fridge was on hydro from the get go. I always herd that you could only run the A/C and maybe another appliance but that most of the time only the A/C.

    I returned the generator got another one without any problem but the problem persists.

    before i go back to the generator place i want to make sure i am not overlooking something with the A/C unit.

    the breaker in the trailer is 20 amp and it never pops. that is why i thought it was the generator.
    is there something you might recommend me checking before asking for Another generator?
    i really appreaciate your help here. thanks



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Dometic Master
  • 6,674 Answers

I take it you have RV plugged into generator. Hopefully direct with no extension cords. Are you using a 30 to 15 amp adapter to plug into generator? What is the rating of the breaker on the generator that keeps tripping, suspect it's only 15 amp?

Posted on Jul 20, 2009

  • Mike Butler
    Mike Butler Jul 20, 2009

    Generator manual should say, but I would hope if 30 amp plug on generator, it is a 30 amp breaker but would be good to confirm.
    Try running your fridge on propane, if it's on hydro, as well as water heater. You have to remember that the 30 amps is distributed to all electrical appliances that require hydro, so if they are all on hydro instead of propane, it will reduce the amount of amperage available to run AC. Also, if you can, test a receptacle or 2 for voltage reading & see if maybe generator not putting out 110-120 voltage . If the generator is supplying lower incoming voltage, that will cause all hydro appliances to draw more amperage than normal.

  • Mike Butler
    Mike Butler Jul 20, 2009

    Low freon is a possibility but I'm not leaning that way yet. Has anyone done a thorough cleaning of evaporator & condenser coils & fins since new? You see, when they are dirty,(even though you clean filters at ceiling assembly regularly. ) they work harder, compressor heats up more etc & will cause compressor etc to draw more current. Also, were you running fridge etc on hydro before I asked?



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Dometic Duo Therm RV AC makes clicking noise when turned off

The braker is getting weak and needs to be replaced the act should be cleaned as the coils get dirty and make the units work harder

Jul 19, 2014 | Dometic Heating & Cooling

1 Answer


What size & type generator? On start up the AC unit can draw as much as 17-18 amps in some cases, and if your generator is not designed for a quick draw like that it will die.

Jan 25, 2013 | Dometic Rooftop RV Air Conditioner

2 Answers

I have a jayco pop up camper with a Duo-Therm BriskAir roof top a/c. im having problem with it leaking water inside of the camper? Is there a drain hose? Or wat do u think is wrong?Thanks

Yes there are drain holes in base of upper unit (on roof), which may be plugged. Couple of questions though to see if we can better troubleshoot this for you.
-Do you remember seeing water (condensation) running off roof before when AC was used?
-Have you cleaned filter inside at ceiling lately?

May 17, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

What is the expected air temp on a Duo Therm Roof Unit? Also can they be recharged? Thanks!

They should run 50 -55 F or about 20 degrees less then the indoor air temp... and yes they can be recharged.....

How to add Freon to a Air Conditioner or Refrigeration System


Aug 23, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Installing rv roof airconditioner heat strip

I see what you see also in the manual. The difference is the Heat Strip package that part is optional and the 600212-001 with the optional heat strips becomes the new 600315-001 I talked to Dometic Duo-Therm and the models are the same but they both are not heat pumps but the new heat strip package comes on when told to go into heat mode when you change the thermostat to heat. The part you purchased will fit both model numbers you listed for your roof top air conditioner. Thanks, Sea Breeze

May 09, 2010 | Heating & Cooling

1 Answer

Duo Therm Penguin model 610115.311 AC unit no-power

Actually you should have fried you converter. What is the voltage reading you get for the air conitioner? supply? One should run off the generator and the other on shore powerIs it set up that way?.

Sep 28, 2009 | Heating & Cooling

1 Answer

Duo Therm AC/Heating not working at all after tripped breaker.

I had to get on the roof of mine, remove the cover and manually spin the fan. Add a little oil to the shaft where it goes thru the bearing. All of this is done on the roof side. Mine required this procedure every spring. Duotherm realizes they had a problem and have since corrected it but they don't deal with all of their customers that had the original problem.

Jul 20, 2009 | Heating & Cooling

1 Answer

No Power to Duo-Term Thermastat

Can you give me model #'s of thermostat & AC unit, as well as upper unit? Number of or at least a description of thermostat, and numbers for ceiling assy should be visible when filter taken off, as well as # for upper unit should be tagged on bottom of unit on roof.

Jul 17, 2009 | Heating & Cooling

1 Answer

Breaker turns off when air is turned on

The compressor has a short going to ground .when resetting breaker stand off to the side they can and do explode. you will need service. Tom

Jun 23, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

My Duo Therm Runs good until the outside Temp. Reaches about 75 dregees Then starts kicking off the braker. What would cause this?

Too many things on the same circuit. Try turning everything electrical off but the ac and see if it stops tripping the breaker.

Jun 08, 2009 | Dometic Rooftop RV Air Conditioner

Not finding what you are looking for?
Dometic Rooftop RV Air Conditioner Logo

556 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dometic Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

Donni Steen

Level 3 Expert

659 Answers

mike cooper

Level 3 Expert

884 Answers

Are you a Dometic Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides