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Old 06-02-2020, 12:24 PM   #1
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Water heater mystery?

At least it's a mystery to me.....

Water pressure is fine until the water is hot then the pressure drops to almost a trickle on all faucets. Doesn't matter if I heat the water with the gas or electric. Once hot pressure drops!

I have a Dometic GC6AA-10E, it's in my new 2020 Eagle HT

Any ideas what would cause this??

Thanks again for advice and help!
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Old 06-02-2020, 12:54 PM   #2
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It's possible that one of the bypass valves used for winterizing is barely open, and when it gets hot, it expands and the seal grows. Do you know where the access panel is to get to those valves in your rig? They are usually behind what looks like a air return grill. I would go open and close them and see what position they are in.
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Old 06-02-2020, 01:42 PM   #3
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It's possible that one of the bypass valves used for winterizing is barely open, and when it gets hot, it expands and the seal grows. Do you know where the access panel is to get to those valves in your rig? They are usually behind what looks like a air return grill. I would go open and close them and see what position they are in.
Are you talking behind the water heater?? I can access it.
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Old 06-02-2020, 03:00 PM   #4
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Are you talking behind the water heater?? I can access it.
In most rigs, you can access the supply lines to the heater from the inside, either inside a cabinet or behind a vent type grill. Feeding the heater, you'll see two or three valves that control the water in and out of the heater. Play with them to make sure they are open all the way.
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Old 06-02-2020, 03:15 PM   #5
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Play with them to make sure they are open all the way.

Unless you have 3 valves. You'll want the bypass valve closed. You should have the valve diagram in your owners manual, along with their location.
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Old 06-02-2020, 03:21 PM   #6
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Ok I don't see any valves behind the water heater itself. My water heater bypass is in this panel, the red handle is heater bypass (see picture)....maybe I need to find the water pump and check for valves there?
Besides valves anything else that can cause this issue?
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Old 06-02-2020, 03:25 PM   #7
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Shot in the dark but maybe the hot water softens the water line and allows it to kink somewhere.
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Old 06-02-2020, 03:39 PM   #8
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May help for ideas. I see this in my house:


https://www.quora.com/Why-is-the-hot...e-in-our-home#
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Old 06-02-2020, 03:45 PM   #9
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May help for ideas. I see this in my house:


https://www.quora.com/Why-is-the-hot...e-in-our-home#
Can't read anything, wants me to download an app
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Old 06-02-2020, 03:47 PM   #10
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Why can't any of my issues be an easy fix for a change??? I can't figure this out :-(
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Old 06-02-2020, 03:58 PM   #11
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May help for ideas. I see this in my house:

https://www.quora.com/Why-is-the-hot...e-in-our-home#
How would that pertain? The plumbing system in a RV is completely different than a house. Plus, this is a brand new rig, so I doubt it has "hardening of the arteries" like house plumbing.
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Old 06-02-2020, 04:04 PM   #12
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Ok I don't see any valves behind the water heater itself.
Can you actually see the water lines attached to your water heater tank? There should be a blue Pex line feeding the bottom of the tank and a Red Pex line coming off the top.

I have the same heater, here is what the pipes/valves look like. Find those valves and make sure the top and bottom are open, and the one connection those two is closed.
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Old 06-02-2020, 04:08 PM   #13
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Yes the back looks like that but there are no valves there
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Old 06-02-2020, 04:16 PM   #14
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How would that pertain?.

Why I said "May help for ideas." There were a number of relevant links.
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Old 06-02-2020, 05:01 PM   #15
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Ok I don't see any valves behind the water heater itself. My water heater bypass is in this panel, the red handle is heater bypass (see picture)....maybe I need to find the water pump and check for valves there?
Besides valves anything else that can cause this issue?
I have the same red bypass valve handle in my wet bay but my red handle is turned 90 degrees left for normal non by pass mode. I couldn't read yours in the picture but make sure the red handle is in the proper non by passed position.
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Old 06-03-2020, 09:19 AM   #16
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I have the same red bypass valve handle in my wet bay but my red handle is turned 90 degrees left for normal non by pass mode. I couldn't read yours in the picture but make sure the red handle is in the proper non by passed position.
It is, otherwise there would not be water in there. It has water.

Going out on a limb here but would being hooked up to 15 amps be a problem? Out on a limb since I was using the gas side of the heater and not the electric.
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Old 06-03-2020, 09:30 AM   #17
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Going out on a limb here but would being hooked up to 15 amps be a problem? Out on a limb since I was using the gas side of the heater and not the electric.
The power source has no bearing on flow. You're going to have to do more detective work, snoop around, and open and close valves. Maybe there's dirt in that bypass valve, or it's not open all the way. If it was one faucet, I'd look closer at that specific faucet.

Besides both of the faucets, what happens in the shower? Does the hot water also slow to a trickle when the water gets hot?
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Old 06-03-2020, 09:49 AM   #18
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Yes it's all the faucets including the shower. I will keep investigating, please keep ideas coming!!

Thanks!
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Old 06-03-2020, 10:08 AM   #19
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Here's another long-shot: Perhaps the WH is too full? I recall reading another post where the user was having trouble with the water heater. He said that he drained some water out of the tank to give it a "head" (pocket of air in the top of the tank to allow for expansion), and was back in business.

Just for completeness sake, I would try to drain the tank, then re-fill it and see what happens.

If possible, while you have it drained, see if there's anything in the tank. I'd think you would need a borescope for this, but you never know...

Also, have you let the water in the WH cool down? Is pressure restored on the hot side at that point? In other words, can you duplicate the issue at will?

It's strange that this condition only presents with HOT water...
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Old 06-03-2020, 10:20 AM   #20
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Here's another long-shot: Perhaps the WH is too full? I recall reading another post where the user was having trouble with the water heater. He said that he drained some water out of the tank to give it a "head" (pocket of air in the top of the tank to allow for expansion), and was back in business.

Just for completeness sake, I would try to drain the tank, then re-fill it and see what happens.

If possible, while you have it drained, see if there's anything in the tank. I'd think you would need a borescope for this, but you never know...

Also, have you let the water in the WH cool down? Is pressure restored on the hot side at that point? In other words, can you duplicate the issue at will?

It's strange that this condition only presents with HOT water...

Good suggestions, I will try them....Yes once the water heater is off and cools a little bit pressure it back.
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