Question about Dometic Rooftop RV Air Conditioner

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My ducted roof top Dometic Briskair will run fine when first turned on for one complete cycle, then the next cycling is short cycling, 2-3minutes on and 30-60seconds off.

During these short cycles the fan will sometimes go off when the compressor turns off, but sometimes it will stay on. I have made sure that the vents are not blowing on the thermostat, have replaced both capacitors, and replaced the thermostat about a year ago. The unit is cooling well but I am concerned that the short cycling will burn out my compressor. Model 57915.622 C&D

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Sounds like a low freon issue. Even though its cooling well at first after its run a cycle the amount of freon is to low causing it to cut out probably from lack of freon pressure. Get it checked soon cycling will definitely shorten the life of your compressor. Hope this helps Chris

Posted on Nov 06, 2014


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Posted on Jan 02, 2017

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Check at the compressor terminals between the Red and the terminal for the overload protector to see if you are getting power to the compressor on startup.

Posted on Jul 24, 2008

  • 417 Answers

SOURCE: compressor tries to start but want

you have to run a contractor grade extension cord(10-12 gauge) from your rv to run those or theyll do that, the lower the gauge the better, best bet is to plug the rv directly into the outlet, if you cant, get the shortest and thickest extension cord you can.

Posted on Aug 21, 2008

  • 415 Answers

SOURCE: AC compressor will not engage

It could be the capacitor, it could be a loose wire connection, it could be a delay switch or a contactor/relay.

Posted on Mar 31, 2010

Testimonial: "You gave us a couple extra ideas than what we already thought of checking. Thank you. We will trade out parts from working one, see what it is. Thanks"

SOURCE: 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.

Posted on Jun 25, 2010

Testimonial: "The blower fan works fine. The breaker only trips when a load is put on it, but not always. I think the overload protecter could be the problem. Thanks."

  • 1420 Answers

SOURCE: Have a 2009 34' Cougar 5th wheel with a roof

Sounds like a bad contactor. The contactor will be near the compressor on the roof.

Posted on Mar 12, 2011

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Dometic ducted a/c will come on and cool---but when it cycles off it will not come back on for hours. have replaced thermostat, circuit board and capicitor. still have same problem---can anyone help??????

Hate to have to ask you so many questions but something isn't adding up here. Original post said it cycles off and will not come on for hours, yet, last comment said if fan on high, compressor kicks in and out every few minutes, so I think I'm getting a little mixed up, sorry. So i need to ask a few more questions. How old is the unit roughly? Has it been working good up until this happened? Have you tried dropping the ceiling assembly down by removing the 4 bolts holding it to roof unit, and looking on the forced air side of the ceiling assembly to make sure there is no obstructions to duct work such as rubber roof material hanging down etc, that would block any flow to ducts. Do you have all, or most of your ducts open to allow cool air to distribute itself properly? If you have done all this work yourself, have you tried by-passing the thermostat and connecting wires at control box, to see if unit stays running that way? If you didn't do the work, don't guess, please.

Jun 23, 2011 | 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

Not cooling

check the and see if the condenser fan is running. you will find it if you take the top off also check and see if the condenser coil is clean. if it is dirty or the fan under the top is not running it will cause the compressor to short cycle on limits or overload.

May 29, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I need to find a cycling thermostat for a Dometic Roof top unit

I ran across the same problem and found the kit to expensive. I gutted the parts added a transformer, contactor and thermostat. Unit worked great and cost about half the price.

Jan 04, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Only at night the unit runs fine day-time it short cycles and will shut completely down and restart not just compressor the whole thing

Has anyone cleaned coils inside, as well as taken cover of on roof & done the same? If you remove inside filter etc, and look way up in front with a flashlight, you'll see coils that need cleaning usually. I use a shop vac with brush & long extension. Tight fit near top, but can be done, without damaging coils. Then take cover off on roof unit (with breaker shut off ) & clean both sides of rear fins, as well.

Jul 08, 2009 | Dometic Rooftop RV Air Conditioner

5 Answers

My dometic 15k brisk-air cont. cycles on-off

Actually, the dealer is somewhat correct. In the hotter months of the summer, the rooftop units have a tendency to freeze up if not run on high cool due to the lack of air movement across the evaporator. If the unit fines on High/Cool, then run it in that mode but adjust the thermostat.

It should not however, cycle on and off that fast unless you have a bad freeze switch or the incoming AC is too low. If during that 8-10 seconds, the air begins to get cold and then it shuts off, then I would say you have a bad freeze switch. If it runs fine on high, but shuts off in low, I would say it is a lack of air movement.

Hope this helps,


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Jul 06, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a duo therm air conditioner think thermostat problem

Google dometic rooftop air conditioning parts!Wouldnt suggest using off brand parts maybe diffrent?if that one is set up for 12v also maybe deffinatley diffrent!!!Try cleaning condensor aluminum fins on roof top if condensor is dirty will throw whole system out of whack!!!use oven cleaner and hose with nozzle be careful not to bend fins throughly rinse off cleaner after soak period spray off completly off roof and sides quickly!!!!!may damage decals etc!!! anyhow try that before replacing parts then use factory or alike parts!!!Good Luck!!!

Jun 24, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Compressor short cycling

If the compressor is run off of a relay then you could install a delay timer to prevent short cycling.

Jun 04, 2008 | Dometic Heating & Cooling

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