Question about Dometic Rooftop RV Air Conditioner

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Rv air conditioner leaking

Have had problems with duo therm air conditioner leaking inside camper. water dripping/pouring into floor from vent. Just replaced board and gasket...still leaking

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  • giovo45 Jul 17, 2008

    My dometic also leaks inside the motorhome. I see water dripping off the side of the RV, but when I turn the A/C unit off, the water gushes off the side of the RV.

  • Anonymous Jul 18, 2008

    condensation leaking

  • mommy to 4 Jul 19, 2008



    we are camping in Stone Mountain,Ga. AC has been woring fine for the last week, but this evening it started to drip when it was running. when the fan turned off, water gushed into the capmer. The fan turns off but the compressor (I guess) still runs and thens blows the breaker. It has,up to this point been draining outside. Can this be due to a dirty air filter?

  • tgolino Jul 19, 2008

    Water dripping inside in coach after running several hours.A/C seems to be draining outside but also drips inside. Dealer replaced the gasket but still leaks.This a/c is installed on a class B unit. Sometimes after the unit is off while driving and applying the brakes water again drips in. The pan was checked with no cracks.I notice when I turn the unit off a big push of water comes out the outside.

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I have the same problem....it is a negative pressure problem holding water inside the unit until it overflows the pan and runs into the duct system. why this occurs....I don't know....I cant find a problem with my air return, but as soon as you turn in off, the water comes gushing out the drains on the unit. I resolved this....temporarily....by twisting up a paper towel into a wick, and placing one end up into the drain tray, with the other end lying well out into the exterior case. This lets the water wick out and keeps the tray drained. I don't understand the problem and don't know what the permanent fix will be, except maybe cutting a hole and placing an intake vent directly below the unit.

Posted on May 11, 2009

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In each of these cases I would check for proper connection of the return air vent to the A/C from below. Static pressure from insufficient return air could cause negative pressure to hold back on condensate drainage. when the unit is shut off the pressure becomes equal allowing water to drain. Also check air filter and clean if found necessary.

Posted on Jul 18, 2008

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  • Dometic Master
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It probably a dirty coil. when the air passages are restricted it increases negative pressure. residential units require a trap on drain line to overcome drain issues.

Posted on Jun 20, 2015

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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.
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Remove the filter at ceiling and run the AC on cool etc, and see if you can feel cool air leaking across to return air inlet where the divider between cold and return is. Check along all edges, etc for any cool air . Careful of wiring, but you should be able to get hand in there and feel especially around the edges where it should be sealed tight. Quite often a leak in that area causes cold air to enter return air and causes excessive condensation. Another thing to check is look way up inside opening for return air, with a flashlight and see if any dirt/dust on coils and fins of evaporator, and if so, needs to be cleaned off with a vacuum, and brush attachment. Let me know what you find.

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If the unit is off level it could cause a draining problem too.

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I am not en expert at RV A/C units. I have worked on a couple before. There should be a reservoir somewhere under the evaporator coil(looks kind of like a radiator in a car but much smaller). It should have a hose or something to drain it away from the a/c unit. These very often become plugged on any kind of A/C unit. However if you choose to do this on your own, you will have to climb on top of the RV and remove the cover from the a/c unit to do this. It might be safer to take it to an RV repair shop.

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