Question about Dometic Rooftop RV Air Conditioner

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Duo Therm dripping water in camper when shut off. My Dometic Duo Therm Ducted AC drips quite a bit of water when shut off after running for several hours on hot humid days. The condensate lines are open. The lines drip steadily while the unit runs. When shut off the lines flow a great deal of water, suggesting that the pan is full. At this point I notice water dripping from the duct work. Thank you for your help!

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  • Mike Butler
    Mike Butler Jul 10, 2010

    Dripping from all ducts, or just at ceiling assy where filter is?

  • wadesmith Jul 10, 2010

    Dripping from the ceiling assy where the filter is. Water then runs over the ductwork. I see evidence of water spilling out of the rooftop ac unit condensate tray. THe motor coach is parked in garage and not moving. As mentioned before, water spills when shut off. Thanks for your help!

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  • Dometic Master
  • 6,674 Answers

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.

Posted on Jul 10, 2010

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