No Hot Water ? Ideas?

[GWKincade]

First - -I hate plumbing -

I never know what to call anything...

We have a 2019 Reflection 150 series 295RL We have spent several months in it traveling and in Arizona. We have been parked in Arizona since the first of the year and all is well.

Today the hot water pressure went very low then to nothing. (Wife in the shower and not happy).

I drained the hot water tank and flushed it. - No help. Strange thing - I opened the hot water valve in the shower - nothing - but when I opened the cold water valve on the bathroom sink, water started coming from the shower head (hot water valve open).
I switched to dry camping and turned the water pump on - no change.
I don't believe it is filling the hot water tank after I drained it. Opening hot water valves should let air escape from the tank, but no air.
I'm guessing that something has gone wrong with the Nautilus panel.? I'm not anxious to tackle that.

Ideas / suggestions?

Thanks...…..

[D2Reid]

Sounds like the check valve on the water heater. But to rule out other simpler stuff;

Did you turn any valves just before the hot water quit? aka did you turn the water heater bypass valve?
Is hot water coming out at the sinks? aka no hot water at all

Just for fun here is a Not very good check valve replacement video.

[GWKincade]

Dallas.. You were correct. I called Grand Design and spoke with a tech support person that pointed me toward the check valve. It was fairly easy to get to. I soaked it in some vinegar and all is well now.

Good help from Grand Design...… and this forum.

Thanks...……..