Originally Posted by Atin17
This might be weird but maybe y’all can help... I noticed my kitchen sink would clog & water had a hard time going down, I tried plumbing it work very little , snaked it, hardly nothing came out.. I unscrewed the (cheater trap) in the sink & it went down without coming up .. I thought great news.. until I noticed water coming out of my outdoor kitchen sink while I had the indoor kitchen sink running.. sounds confusing but maybe y’all can help I’m thinking there’s a check valve fault but my knowledge to check valves in rvs is little to none. I have a crossroads high country 32rl ..
If you used a plunger & a snake on the Hepvo (cheater) trap you likely messed up the rubber bladder with the snake or sucked inside out with the plunger. That thing has what looks like a piece of bicycle inner tubes that's flattened out, so a replacement is probably on your to do list.
I also agree it appears you have a full grey tank, don't count on the tank level sensors to give you any useful accurate information.