Disclaimer: In general, this forum is intended to be a place for Grand Design owners to gather and exchange ideas regarding their use of and experiences with Grand Design products. Any information contained in the forum should be independently verified by checking with Grand Design, one of its authorized dealers, or reviewing your owner’s manual.
If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You will need to to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below. Thanks for visiting and your interest in Grand Design!
By chance are you attached to the campground sewer with the valves open? Try closing if so.
The other issue could be the AAV (air Admittance valves). There are 2. one in the bathroom vanity at the back almost to the counter top and the other in the island again up high. Both are on the sink drains (follow the plastic pipes from the drain to the TEE then UP.
I replace both of mine with the https://www.homedepot.com/p/STUDOR-R...0353/203111264 (avoid the larger as they may be too large in diameter and contact the walls). Both of mine were less than hand tight and I was actually surprised they had not rattled out.
This is not an uncommon post on all RV forums. I wonder if it could be related to the black tank flush system. Here is my reasoning:
The air conditioner neither draws in outside air nor exhausts inside air outdoors, so the smell can’t come from the outdoor part of the vent.
All normal paths from indoor space to the black or gray tanks are supposed to be sealed via P-traps, duck bill valves or AAVs.
The anti-siphon valve is located in an interior wall space which may be connected to the duct space of the air conditioner or the air space between the coroplast and the floor creating a potential path from black tank to indoor air.
The anti siphon valve admits air to the hose connection side of the black tank flush when not pressurized. When pressurized, the valve compresses a spring, moving the seal which opens the path to the tank and closes the path to the air. If the seal on the tank side failed or there was debris on the gasket, it’s possible for there to be a path from black tank to air inside the camper when water pressure isn’t present.
Certainly speculation, and an empty trap, failed AAV, damaged vent pipe or otherwise compromised drain could also be the culprit.
Comment