New 2017 315RLTS. First camping trip went to use the shower and getting nothing but scalding hot water (single handle faucet). All valve settings on the outside were set to city water and I also tried it with dry camping but got the same results. Took panel off the back of the shower and both the hot and cold lines felt hot. I have looked at the plumbing from a small access window outside the RV and everything looked ok. The shower is a single handle I did take it apart and didn't notice anything out of the ordinary. All other faucets in the RV work just fine this includes an outside to handle shower. There is a small device in wall next to the hot/cold lines it reads (B&B mod 521) not sure what it does. Does anybody have any recommendations?
I think I found the problem. It appears Jayco has the cold line that goes to the shower faucet actually going to the black tank. The line that should be going to the cold side of the faucet is actually going to a check valve. This explains why when we took a shower after letting the hot water cooled down that the black tank seemed to be feeling up sooner than I thought it should. Need to take to the dealer to fix the line since they are crimped on pex lines. Still under warranty, only had two months...new.
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