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We have a Dometic B1900s on our caravan and the water from the outlet drain just runs all over the roof does anyone know if we can fix an outlet pipe to it to direct the drainage off the roof

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Yes you can modify the pipes. Just be sure that your pipes are installed at a downward slope to allow for the water to drain.

Posted on Feb 20, 2009

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HL means the drain trough in the indoor unit has flooded and caused the float switch to operate. If you have a look outside, there should be a drain pipe coming down from the roof and attached to your wall, this is where the condensate water would normally drain from the machine. The drain pipe or drain trough outlet has probably blocked up.Carefully blow air up the pipe to try and clear it. Watch out when it clears as water will suddenly run out and you don't want to get a mouthful of dirty water. Don't stick a garden hose or anything like that up the pipe.

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2007 H2 leaks water from A pillars on each side. Water pools above A pillar, drips down. Water also trickles a steady stream from the 2 (covered screw) areas on handle under A pillar. Already had sunroof...


i know you said you have flushed through the sunroof drain channels , have you actually cleared all four out let tubes , one ine each corner of sunroof tray ,there are rubber tubes from these outlets tath emerge at the wheel arches behind inner arch covers its ussually the back ones that get forgotten ,a good tool to use is a flexible domestic pipe cleanring rod ,used by plumbers for sink blockages etc let me know if this was of any help cheers

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My high efficiency furnace has water (possibly condensation) running down the air intake pvc pipe into the furnace and all over the burner, gas valve, and wiring.


First, check the drainline from the furnace. You have a 90% gas fired furnace. Where 80% furnace has 1 heat exchanger, yours has 2 heat exchangers. And the second heat exchanger will cool the exhaust enough, that it ends up below the dew point, and your furnace outlet/exhaust will condensate. This drain is probably stopped up. Now, I've installed and service many of these systems and I've only seen the piping at the roof you described once. And that was when the roofers replaced the roof, damaged the furnace flue pipe, and tried to repair it themselves. Normally, and this may not apply to yours, we tie in the exhaust/supply lines about 2-3 ft. above the furnace. Then 1 pipe goes through the roof. Thus 1 pipe is a kit that has an inner liner & outer pipe(2 pipes in 1). Now I'm not sure if this is a problem or normal for your system, but it may be worth looking into. You should be able to find it in the installation manual, or call a local parts house that sells your brand, or as your tech. And if it's just your drain, forget all about the piping I mentioned. Hope this helps!

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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.
-Do you remember seeing water (condensation) running off roof before when AC was used?
-Have you cleaned filter inside at ceiling lately?

May 17, 2011 | Dometic Rooftop RV Air Conditioner

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My Dometic AC is mounted on a sloped roof (as are a lot today). However in humid weather when the AC is putting out a lot of water, the fast speed of the fan pulls water out of the evaporator pan and...


Clean air filter and evaporator coil periodically. And also insulate tightly for the pipelines including drain pipe also. The heat hose observe the water over the pipelines and evaporate. Thanks and helpful?

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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.

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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.

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Thess units are designed to discharge the condensed water onto the roof under normal conditions. HOWEVER you should be able to have a sheet metal person make up a drain pan to fit under the unit.
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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.

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