Question about Dometic Rooftop RV Air Conditioner

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Leaking inside when turned on

I have to put a bucket under my airconditioner when we turn it on. it leaks inside terribly. it also runs down my roof inside my rig.

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  • rll1970 Feb 05, 2008

    Bravo, guru, thanks a bunch. I had mud dauber problem with drain. Used one of my wifes crochet hooks and cleaned it right out. Your the greatest. Thanks


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What you have is a clogged drain. You are going to have and get on top of your rig, pull the over and clear the blockage. That is normal to happen over time. Had to do the same thing to mine. What is happening is the evaporator (the cool coil) gathers moisture an sheds it off, then is always some area for the water to drain out of the evaporator so it doesn't do what you are experiencing.

Posted on Feb 03, 2008

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1 Answer

Roof leaking on 2003 breckenridge camper

Most roof ac units sit on a seal that fits around the opening outside, and on the inside there should be 4 long retaining bolts that that have or go thru some brackets, that squeeze the unit down. Kinda "sandwich's" the roof, if you will. I've simply tightened these 4 bolts carefully, and stopped the leak. Or the seal is damaged. And it also may be the drain. The opening will be under the plastic shroud. With the shroud removed you should be able to see a small opening near where its wet on the roof. I normally spray quickly with water at the opening. It normally clears easy. Condensate drain or weather seal.

Jun 27, 2015 | Heating & Cooling

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The unit has a leak and is low on charge (freon) Find and fix leak, then vacuum and recharge...Leak is probably in flare fittings behind unit...
Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool...

AirConditioner Trouble - Review the Possibilities


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I have a split unit airconditioner 12000btu.It worked great for about almost 5months.till yesterday,when I turned on the air con,I didn't feel cold.I just felt normal wind blowing.then after 5min a...

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Please check amps with amps meter reading. If very less amps than specified, it's under gas leak. Even you can physically touch the discharge (small) pipe while running, if it's not warm, gas leak. Call repairman to check and arrest gas leak and then recharge gas.

Dec 25, 2010 | Heating & Cooling

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

1 Answer

Water leaks from the roof unit

This is condensate (which of course is water) that is coming from your unit. This is very normal ... Is it leaking inside or running across the roof and down the side of your unit? If it is going inside, there is a drain in your roof unit that is clogged. You must clear the clog. Remove the cover and inspect the base. Turn the unit off first.

Sep 19, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

My roof airconditioner leaks drain water on the floor.

make sure the drain is not plugged and that condensation can get under the cooling coil to the drain pan otherwise it may be condensation forming on the grill, make sure the filters and coil are clean and you are moving lots of air.

Jun 02, 2010 | Coleman Mach 15 Air Conditioner

1 Answer

Contensation leaking into camper

Check on roof, look under at base of AC unit for 2 knob like things sticking down, they are drains. use a piece of wire or small stick & try to poke inside there. You might have to look hard to find hole. Pay attention to run off on roof, if not as much as usual, that's a good indication they are plugging up. If too hard to get to, remove 4 screws & pop cover off, but watch for wasps or yellow jackets before you do.

Aug 06, 2009 | Coleman Heating & Cooling

1 Answer

My a/c is leaking from the ceiling of the rv. i cant tell exactly where, but something isnt draining properly. does anyone have a clue as to what i can do about this? my rv is a 1989 model. the a/c is cold...

Look between roof & base of AC unit for little round button like pieces sticking down, which are drains, that have holes in sides that get plugged up. poking with a piece of wire or similar in that hole may unplug it. You should see at least 2. Depending on what type of AC unit, it may just be holes in base for drainage, but if necessary to unplug, you can easily remove cover. Coleman has 4 big Philips screws on top to remove & dometic has a bunch of Philips screws around lower edge to remove & cover will come off, to check where plugged. Make sure power is off inside.(breaker) You should see a trail of water across roof from AC when running & cooling, if not plugged. There is the posibility of a cracked drainage tray allowing water to leak inside as well on some of the older models. You should be able to inspect all of that when cover is off on roof. P.S. CAREFUL! Observe before lifting cover off for wasps in the area, as not unusual for them to make nests under cover. Be prepared, or do on cloudy day, early in the morning, or near sundown when less active. Also, if dew on roof, could be slippery.

Jul 07, 2009 | Heating & Cooling

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

3 Answers

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Either your 14"x14" a/c gasket is lose on the roof allowing the condensation to flow into your RV or you have a cracked condensation tray under the evaporator. I'm guessing the later


Aug 01, 2008 | Dometic Rooftop RV Air Conditioner

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