Hot water flow

[Beachbum2]

Hey everyone,

So this morning my wife goes to turn on our hot water in our 1 month old 5th wheel and it’s barely flowing. So I check the forum for some info and a few mention bad valve, and some mention calcification among other things. Well I jingle the valve that would cut of the flow to the hot water tank and suddenly we have hot water flowing again.
My question is…has anyone else experienced this on a nearly new out of the box unit? And will it keep doing it?
If so…is there a permanent fix?

Thanks

[Jagiven]

Was it the shut off valve or a check valve you played with? How many ball valves do you have? Are the two way or three way valves.

My guess you have a single three way valve to direct the water flow to the tank, or to bypass the tank. If I am correct, the water heater outlet than has a check valve to prevthe tank from back filling. By flipping the valve you may have upset the water pressure and it released, allowing flow.

Old school, three 2-way valves are the most reliable method. One at each of the WH inlet, outlet, and bypass pipe. Usually open the bypass close off the tank to winterize. Reverse for daily use.

[Marcm157]

Just to quote a long time Auto Mechanic -

NEW means Never Ever Worked!

[Beachbum2]

I believe it is a two way valve. It’s the one that you would use when you are Winterizing the Rv. The only valve there is from the tank to the unit.

[HecBec]

We have had inconsistent hot water pressure in our 335T. Reported it to the dealer last year, no fix. Have experienced it again this year and have not found a cause yet. Do you have the Nautilus utility center?

[Beachbum2]

Yes we do. I just kept moving the leaver for the hot water “switch over” back and forth while the water was connected.
Possibly it flushed something stuck in the line out. I’m thinking during manufacturing there is not too much care taken to avoid anything falling into the opening of the water lines…just my thoughts!

[TWP723]

Strange that just jiggling it made the flow better. Usually, you'd have to twist the valve back and forth for it to engage or disengage it. Wonder if there was construction debris in the valve? Or the valve is bad.

[Beachbum2]

Sorry…by Jiggling I meant opening and closing it rapidly. But yes…I’m thinking Consruction debris.

[Camperdude]

Originally Posted by Beachbum2

Hey everyone,

So this morning my wife goes to turn on our hot water in our 1 month old 5th wheel and it’s barely flowing. So I check the forum for some info and a few mention bad valve, and some mention calcification among other things. Well I jingle the valve that would cut of the flow to the hot water tank and suddenly we have hot water flowing again.
My question is…has anyone else experienced this on a nearly new out of the box unit? And will it keep doing it?
If so…is there a permanent fix?

Thanks

Ok so I went through the same thing this past weekend. I have a 319MLOK. Cold water, worked flawlessly on pump. Hot water, pump would kick in and out. Stream would go from a trickle to decent as the pump surged on and off. Did some reading and found everything from air cushion in the HWTank to check valves replacement topump pressure switch adjustment.

Thought I'd try the easiest first. Drained the hot water tank, replaced the plug, hooked up the water hose and charged the system on city water setting, which fills the HW tank being mindful to leave the pressure valve closed (in the past I've always opened this until water comes out thinking it fills faster). Went in and tried all faucets on hot. Until all air was out of them. The flow was great. So I switched to dry camp and it was the same. The pump motor didn't surge/ stop/start and ran continuously until the faucets were closed. Just like it was supposed to.


Now..... apparently there needs to be a natural air cushion in your HW tank according to some. And apparently this keeps a steady pressure on the hot lines and without it you could get uneven pressure which will tell the pump it's needed or it's not.

This worked for me. I'll see what happens when I go camping again because I always drain the tanks when not in use.

It's worth a try.