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Question DetailsAsked on 1/14/2015

Sewer smell in new park model bathroom. Vanity vent cap + toilet seal changed, didn't help. What next?!!!!

Nothing leaking under RV, had plumber check out pipes. Could it be something to do with the heat pump/ac unit? Smell is intermittent, can be totally gone and then comes back suddenly, mostly at night when it cools down. Very frustrating, as it seems to be only accumulating in the bathroom area. Our plumbing is connected to the park septic system.

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1 Answer


An A/C unit can give off a mildewy/moldy smell due to buildup of dirt and mold on the evaporator, but that smell would be coming through in your ventilation air, not confined to the bathroom. If smell is accumulating in the bathroom, sounds like that is the source of the problem.

I would check around under vanity, and crawl around on hands and knees and see if you can smell it stronger at any particular point, Could be a water leak causing rot in the walls or flooring that has not shown up underneath yet.

You say the vanity vent cap was replaced - that intrigues me - I presume you mean an air vent because you do not have one going outdoors ? That would be an obvious place for a smell to come from - you might try putting a plastic bag over it for a day, taped tightly around the pipe below the vent. If smell goes away, problem was probably that and need perhaps a different brand. Note doing this can cause slower draining from sink and such, and if only vent in the RV you could get some sewer gas coming up through other drains, so keep alert for that - if that happens you need to remove the bag to restore ventilation.

The sudden return of the smell leads me to think sewer gas venting through the vent cap, or something in the walls or flooring that gets sucked into the RV only when the heat pump/AC is running and perhaps drawing a partial vacuum in the RV ?

One other thought - have you checked for a leak from your holding tank and associated piping/dump valve ? Or a blocked/failed tank vent (presumably through the roof ?)

Answered 5 years ago by LCD

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