Help -- Hot/Cold Reverse when connected to city water (RT210P 1996)

[gkise]

Hi Guys:

I have a 1996 Roadtrek 210P. It's a new rig for me and I'm still getting used to it.

I decided to check out city water connection this weekend. What happened is the hot water and the cold water reversed. They came out of the wrong taps!! When I disconnected and went back to using pump it resolved and ran normally (i.e left hot and right tap cold).

Also, even weirder, when I was about to leave I ran some fresh water (using the pump) into the toilet and the water was hot!

So here are my questions:

1. Obviously -- what the heck is going on?

2. Is it a check valve issue? I read that it could be calcium clogging a check valve. But it so, where would it be located?

3. The manual says:

iii) Close front tap at city water to prevent fresh water tank from filled and

iv) If you vehicle is equipped with an optional water heater, close the rear tap at the city water connection to prevent water from exiting from the hot water drain system." BUT my system doesn't have a "rear tap"

But I only can find a "front tap" we've looked high and low and there is no rear tap. Any ideas where to find this? or was it replaced with a check valve?

That's about it, this is extremely perplexing. If you guys think it's calcium, then I could do a vinegar flush?

Thanks for the help!

(Note I did replace my hot water heater with the exact same model (SW6D) the installation was easy and smooth. I used the same connections and do note there was no other valve inside the water heater compartment)

Thanks!
~g

[markopolo]

If there's a bypass at the water heater check to make sure it's closed.

[mkguitar]

hot from the water heater hot? or hot from being in a hose in the hot sun?


Living in Phx my home tap water this time of year is often 80~90º- water from a hose in the yard is probably 140º ( kills plants) until the line clears



Mike

[gkise]

Thanks! That's what I initially thought, but no bypass.

[markopolo]

Same problem reported here: https://www.jaycoowners.com/forums/f...tml#post338716

and the cause of the problem here: https://www.jaycoowners.com/forums/f...tml#post340084