Question about Dometic Rooftop RV Air Conditioner

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On my 28 foot Itasca motorhome the air conditioner is leaking water through the gasket on the roof. I pulled the inside cover off and took out the four big boltd holding the roof top section, but I can't begin to even move the unit. I don't dare pry on the ceiling to try to lift it. Am I missing something or is it like a two man project.

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You need to find where the drain is. The water should flow to a drain and not into the unit. Once you get the condensation draining properly you can use a good quality silicone to seat around the unit. You might check at a RV parts place and find a product they recommend for RV roofs. Hope this helps.

Posted on Nov 19, 2009

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1 Answer

How do i find drain holes maybe be blocked leaks whenrains


Check the bottom corners, one of them has a white rubber hose coming from the unit and may only be patruding out a little or you may need to look from close to the roof level to see it. Run a flexible wire, say #14 THHN into it about a foot to 18" and rotate it as you push it through. You should see debris and water coming out when its cleared. Yes, splashed rain can contribute to the full collector tray and leak through the duct, and so will a bad roof gasket that is between the roof and the unit. If you still have a rain leak after the tube is clear, then change the roof gasket. Good Luck!

Oct 15, 2014 | Dometic Rooftop RV Air Conditioner

3 Answers

The 'H' frame leaks


If the unit was installed buy the agent then they are responsible to stop the leak don't let them get off of taking care of it. make sure they are pulling the unit off the roof to replace the gasket and just putting silicone around the edges because it will just pull a loose when pulling camper due to body flex. if you put plastic over unit you know there is no water leaking from inside the unit so it only can becoming from around it. Bad seal

Jul 03, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

How do I fix the drain lines from my rv roof?


have to remove cover to access drain lines to clear

Jun 10, 2014 | Coleman Mach III Air Conditioner

1 Answer

Water Leak from roof


possible stopped up drain or coil iceing up.

Nov 26, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

I have coleman air conditioning units on my 1991 Georgie Boy. They both leak... water from rain and also when units are shut off, lots of water comes back in. I bought gaskets but it looks like someone...


I'm thinking that motorhome has a rubber roof, so you don't want to cut at roof, or you'll likely end up cutting rubber roof which is certainly not a good idea. It may take some work but try prying and scraping with a plastic scraper while someone lifts up ******* upper unit. Quite often whatever sealant they've used to seal between roof and gasket will start to let go with constant upward pressure.(lifting) If you have fiberglass type roof and not rubber, scrape and pry where gasket meets roof.

Oct 05, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Our penquin dometic air conditioner in the bedroom pours leaks lots of water when the unit is on during rain storms. Water leaks into the ceiling and also out the unit.


Sounds like base gasket at roof is loose or defective to start with. Try removing ceiling assembly enough to tighten 4 bolts that secure roof unit to inside bracket. Do not compress too much, just snug them all evenly and see if water slows or stops. If not, you will have to remove upper unit (roof) and replace gasket and re-secure but don't tighten to excessive, only compress gasket approx half of original thickness. Also make sure upper unit is aligned properly with opening of roof.

Sep 23, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

RV AC is working fine, but the water is leaking from the ceiling Where is the drain tube on the unit, The AC unit is a roof type, Duo Therm serial # 43404934, Part # 3105459


Normally, the condensate will drain out of the unit onto the roof and off the edge to the ground. Remove your cover inside (probably 2 screws) and tighten the 4 bolts you will find inside. If they are tight, go to your RV supply place and get new roof gasket. Remove the AC and insert the new gasket and resecure the AC to your roof.

Thanks for your question @ FixYa.com

Jul 26, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a travel trailer with a coleman 7300 roof top ac unit. the unit will blow cold air but water leaks thru the plenum. i was told by the previous owner that it needs a new seal. i would like to fix it...


If it's leaking inside where filter cover is, then real good chance the drains being plugged is the only problem. If water (condensation) not running off roof when operating in cool mode, then I'd bet drains, which are located under unit on roof, and you should see them sticking down like buttons. They have a hole in side that needs cleaning with a pipe cleaner or similar to open them up. If need be, shut off power to unit and remove top cover on roof unit and look for the drain holes in base, and clean them out. If water comes in while raining, but AC not running, then it's gasket. That is remedied by removing ceiling assembly (just screws) and 4 bolts that pull/hold the upper and lower assemblies together, unplug wiring to upper unit, and simply lift it off, change gasket and re-install. Tighten those 4 bolts equally when gasket is aligned properly over hole, only until gasket is approx 1/2, original thickness. Plug harness back in and your done. (about an hours work.) Only other thing that may be wrong is styrofoam drip tray for cooling unit, under cover on roof may have a crack , allowing condensation to leak in. If that 's the case, you can try to find a sealant compatible with styrofoam to seal those cracks.

Nov 14, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

I have a leak and it does not seem to the be the new gasket


They say you should only compress the gasket to approximately 1/2 it's original thickness, and sometimes there are tabs that touch roof to tell you that's far enough. If your sure it's coming in around gasket where it meets roof, try loosening bolts off to allow you to lift upper unit off roof enough to use a caulking gun with a tube of "dicor" self leveling sealant, and run a bead of Dicor around where gasket meets roof , then set unit back down, & tighten until gasket is about 1/2 thickness as new.I always find it better to remove bolts & flip unit on it's side and get good bead down center of where gasket meets roof, then set unit back down, line it up & snug it down.Let it sit for a while to set a bit. Be ready with a rag to catch or wipe any excess that squeezes out from under gasket to the inside, that may end up on floor below, as it's very hard to remove that stuff after the fact.Has worked for me in similar situations.

Jul 01, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Emerson Quiet Kool 700 roof mount air conditioner seems to accumulate water... leaking into motorhome.. noticed open slots on top and sides... should there be a cover for it to prevent rain and snow from...


It should have a drain so that it runs down off the roof instead of into the motorhome. All a/c's have a drain somewhere and they all plug up occasionally. A/C techs always carry coat hangers.

Mar 06, 2009 | Emerson Quiet Kool 12HT13 Air Conditioner

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