Question about Dometic Rooftop RV Air Conditioner

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My Dometic rv roof a/c unit does not drain, how do I clear the drains?

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william simpson

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  • Dometic Master
  • 1,363 Answers

Remove shroud from unit & unstop drain.

Posted on Aug 20, 2015


5 Related Answers


  • 1 Answer

SOURCE: Coleman RV air conditioner

It is not leaking. that is the condendensation it is pulling out of the air. It is suppose to leak on the roof and off the camper.

Posted on Jan 05, 2008


Farley Redfield

  • 462 Answers

SOURCE: My dometic RV rooftop air conditioner is leaking

Remove all covers and look down with them removed and see if the coil drain pan has a stopped up exit where the water drains out and into the rear of the AC unit.

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

Posted on Jul 10, 2009


  • 40 Answers

SOURCE: the dometic roof ac humms when rv is on 110 ac

not likely but possible. if they already had one bad board what's to say their production methods have changed since they made your last bad board. I have just had 6 bad compressors from this chinese company danfoss in one month! for only 2 freezers i have installed 3 bad compressors in each! nobody takes pride in production anymore they want the stuff to break.

Posted on Oct 10, 2009


Mike Butler

  • 6674 Answers

SOURCE: I have a Dometic RV airconditioner roof mounted,

Your probably looking at the control module number or something in that area. When you have the ceiling assy off as in cleaning filters, look for a sticker directly on the base of the roof unit. Look all around on that base, even behind wiring harness, you should find a model number and serial number.

Posted on Jun 10, 2010


Robert Horton

  • 1515 Answers

SOURCE: , Compressor start capaciter MFD value: roof top RV Dometic unit

Hi, I did some research and found nothing on the a/c unit. If I had the model and serial numbers from the condenser and compressor this would help me. This would be a run capacitor doing the start up, dropping out the start relay and keeping it running. If you have only one run capacitor and its a dual, will have 3- female spades coming from the top, with marks that say Fan, C for common, and Herm. for compressor. If it has only one capacitor with2- female terminals, several places to connect more than 2 wires, its a single cap. If it just runs the compressor, it could be a 370 volt x 20, 25, 30, 35, uf?? If its a dual it could be a 370 volt x 5 u f for the fan and the same , 20, through 35 u f or microfareds. The best way to find out is to take off the wires on it, and make sure you draw a diagram so you know they are right, and take it to a appliance parts house and let them check it to see what they are. Larger units can have a 440 volt x 20 to 35, 40, 45 and so on. Your unit is not that large, so it will only be 370 volts as far as voltage, but the u f value will need to be checked with a meter that will check the value of these and give you a number such as 4.99 u. f. and you will no its a 5 u f. It may be higher like 5.24 u.f.and that is OK. Make sure the capacitor has no oil leaking from it or its not swollen looking or distorted in anyway, it will be open or shorted out. Please let me know if I have been of help to you when you go to rate me, please be kind. I will be here if you need my help if you are having problems with the compressor not starting.
A/C & Heating Contractor
PS If this capacitor is black plastic and mounted on the side of the compressor, it will be a start, run capacitor with 2 wires. It snaps in a metal type holder you will need to take it out and check the terminal area it was connected to and remove it. If only 2 wires, it won't make a difference what side the leads hook to.

Posted on Jul 03, 2010

Testimonial: "This is exactually the information I was looking for. The paper label on the black plastic cse was faded, and I wasn't sure of the u f range this comperssor needed. Thanks, G"

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1 Answer

Where are the condensing water drains?on a Coleman RV rooftop air conditioner

The condenser drains for a roof unit drain on top of the rv. There are on hoses which divert the condensation to a location other than the roof. Are you trying to keep it from dripping down at the door?

Jun 28, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer


Get up on top the roof and remove the cover to the unit is what I would do. Clear the obstruction out of the drain pan and make sure the drain hose is clear.

If you need further help, reach me via phone at

Jun 11, 2012 | Dometic Rooftop RV Air Conditioner

2 Answers

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 @

Jul 26, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

My Dometic roof mounted aircon appears to discharge the water straight onto the roof. 1) Is this normal operation. 2) Is there a drain tube fitted, and if yes, where would I find it? Assistance will be...

Yes it is normal for AC to drain on to roof as the drain holes are in base of AC unit. The time to worry is when you don't see it draining on to roof, as this indicates holes may be plugged.

Jan 30, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

13.5 Dometic rooftop rv ac design has changed since I purchased 2006 Monaco Camelot rv. The collection cups leading to the drain line do not fit well on the roof seal and a good seal is hard to achieve. If...

I've not run into the problem your having yet, so I will apologize up front for asking you to furnish more information. These drain cups that I assume are little round pieces attached to the base of the unit where it meets the roof, were not common on dometic, but were common on Coleman AC units. Those are the outlets for condensation to the roof anyway, are they not?
Also, as far as gasket goes, no I wouldn't recommend using 2. We were always advised by manufacturer to compress gasket to half the original thickness when installing either Dometic, or Coleman (RV Products). Coleman at one time, had tabs under gasket that when gasket was compressed, and they touched the roof surface inside, that was far enough, which was approximately half the original thickness. Believe it or not, over-tightening is more likely to cause a leak. Stick with half original thickness, or close to it.

Jun 26, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Roof air not draining and leaking inside coleman unit

there are 2 drains on most units one each side about 6 inches back from the front of the unit - they are white plastic and have a small hole in the side - they may be clogged - happend to mine - used a paperclip to clear out now work fine - good luck

Aug 17, 2009 | Dometic Rooftop RV Air Conditioner

3 Answers

My roof top RV air conditioner is dripping water inside my RV

Check run-of on roof & see if it's been reduced lately, it may just be a plugged drain at base of unit on roof.

Jul 29, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

How do I clean out the vents in my RV Dometic roof ac?

Take it off,the plastic inside vents, with soap water and a hose wash it.  Outside condendor and inside evapator, making sure the drain is open and outside shroad removed, brush off fthe loose stuff. wet both units, put liquid dishwashing soap on both. Spray then through , with a hose untill they rince clean.  While up there. Oil the motor if possible.  Keep the drain clear and open,making sure none of the water is getting into the RV.

May 08, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer


Does water drip out of unit on the roof while running ? If you look under the unit on the roof, you should see one or two little drains sticking down., that may be plugged up. Piece of wire or something and poke in the holes on the sides of those drains to make sure they're clear. Usually there is a plastic/nylon pan on roof unit to catch that moisture, and drain it off. Could be overflow because of the plugged drains, or I have seen the odd one crack but not too much recently, mostly back 5 yrs ago or so they had a run of them.

Aug 13, 2008 | Dometic Rooftop RV Air Conditioner

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