Question about Dometic Rooftop RV Air Conditioner

1 Answer

My ducted dometic roof unit wont cycle on when i try to reset t stat it reads ee i think my upper board is bad

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.

    Vice President:

    An expert whose answer gotĀ voted for 100 times.


    An expert who has written 50 answers of more than 400 characters.

  • Expert
  • 127 Answers

The upper board is a possible problem, however before you drive yourself crazy after purchasing a new one and it not working, try removing the CCC from the wall and obtaining a piece of the cable that connects the upper unit to the CCC. You should be able to get this at any local Dometic repair facility or dealer. With this piece, plug the CCC directly into the upper control and try resetting it. If this does not work, then it is either the CCC or the upper control board. You can also try turning all the dip switches to off in the control board and resetting the CCC and then turning them back on to their original position and resetting. This will sometimes work if the two just lost communication.

Hope this helps,


Rate me please!

Posted on Jul 05, 2009


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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

2 Answers

My carrier ac roof top ducted unit started spitting out small amounts of water now and then, I changed filter. Now with ac in off position I am hearing a humming noise coming from the unit, what can this...

Don't really understand what you mean by roof top duct unit .if it's a roof top unit and water is leaking down your vent then you have a clogged drain line .

Mar 02, 2018 | Dometic Rooftop RV Air Conditioner

1 Answer

I purchased a dometic roof top ac unit mdl#641515.301c0, however on the website i cannot find install manual or user manual

What part about installation are you having problems with, and what are you installing it on? Do you have both upper (roof) unit & lower ( at ceiling) ? Is it a ducted system or blowing directly from ceiling assy?
Check this link as well , you may find 6300 series is same install.

Jun 02, 2012 | Dometic Rooftop RV Air Conditioner

1 Answer

How to replace rv roof ac?

I will assume that you are aware of the fact that both upper ( unit on roof ) and lower control unit ( inside at ceiling ) will need to be replaced. That obviously adds to cost, instead of just replacing upper unit with same as what's there. Be sure to shut power off at breaker panel to start with. There is only 4 bolts, usually 1/4" with either 3/8" or 7/16" head, That holds the upper to lower. Once you remove them, and any extra screws that may go into ceiling from lower unit, the 2 pieces are separate. Disconnect any wiring ( mark wires if thermostatically operated) from lower unit, and if it's not ducted in the ceiling there will be ducting attached from upper to lower unit usually with flanges that have screws in them. 3 Philips screws where it attaches at base of upper unit, and that should drop down. That should be it. Now just lift unit on roof up and off. May take a bit off effort as some stick pretty good. Be sure to watch if you have a rubber roof that the rubber isn't ripping. I have had some that the person who installed it used some sealant at gasket surface, and had to very carefully lift and pry it apart, but as I said, if you find same, watch rubber for ripping. No need to apply anything to gasket if roof is clean, just set new one down over hole, even it up and draw down from inside with new ceiling assembly and bolts equally. Only compress gasket to approx 1/2 it's original thickness when tightening down, do not squish it.

Mar 03, 2012 | Dometic Rooftop RV Air Conditioner

1 Answer

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

1 Answer


The upper unit doesn't matter ( the actual ac unit on roof ) it's the lower control unit (inside at ceiling) that you need to change to use either ducted or non-ducted system. Any RV dealer can supply that, probably have it on the shelf. Just make sure you write down the model number and serial number, off the bottom of the upper unit, so they can match lower unit to it, for ducted system.

Apr 14, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

The airconditioner runs and blows cold ai. When

Hi, the only thing that could cause this to happen would be the thermostat. This is the main part that controls the roof top unit, getting its signal from the stat to come on and maintain the correct temperature. I would replace it with the same type and this will solve your problem. The only other thing that would cause any unit to cycle like this is if you had bad thermostat wiring touching together some where. I don't think this is the problem with yours though. With the stat off and it still cycles on, this tells me for sure it is the stat. Change it out and you will be good again.

Mar 26, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Crazy Heat

I think that I would change out the thermostat only due to the symptoms you are describing. Think the control board may be fine however, the thermostat sounds as if the internal componants are going out. Good luck on your repairs


Sep 22, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Power to the roof but not working

In my own oppinion I would if it is available, as you do not know if something shorted out..also note that you may have too as updates are constantly done in the RV bussiness..I worked at 2 RV dealerships and there were constant updates especialy Dometic refrigerator and cooling units. Stop at the local Rv shop and see what they have or they may order it for you.

Apr 04, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

RV Dometic AC Comfort Control Double EE Problem

I have a dometic duo-therm. The unit works great and fan blows strong and both high and low work., but air is coming out of the ceiling unit rather than the duct work. The bedroom unit works OK, but the air is strong out of one duct, and not much comes out of the others. The front unit only has air coming out on the A/C unit and none out of the ducts.

Mar 24, 2008 | Dometic Rooftop RV Air Conditioner

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

Related Topics:

108 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dometic Heating & Cooling Experts

Bill Long

Level 3 Expert

588 Answers

Tim Whalen

Level 3 Expert

3074 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

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

Answer questions

Manuals & User Guides