Hot Water but no hot water

[marknuss710]

2020 337RLS Reflection with traditional hot water heater

Out of the blue, the hot water stops flowing. Cold water works fine.
Doesn't flow on "city water" or "dry camping" mode
with the Pump "on" the hot water will push water out of the heater tank pressure relief valve when opened.
I drained the hot water heater 2x and there's some reduced flow (60% -70% reduced)

Wondering if anyone knows if there's a check valve on the output of the hot water tank? Or other ideas that could be causing this issue?

Thanks

[howson]

2020 337RLS Reflection with traditional hot water heater

Out of the blue, the hot water stops flowing. Cold water works fine.
Doesn't flow on "city water" or "dry camping" mode
with the Pump "on" the hot water will push water out of the heater tank pressure relief valve when opened.
I drained the hot water heater 2x and there's some reduced flow (60% -70% reduced)

Wondering if anyone knows if there's a check valve on the output of the hot water tank? Or other ideas that could be causing this issue?

Thanks

Yes, there's a check valve on the back of the hot water heater. Mine looks like this:



You can verify this is the issue by turning the red knob on the Nautilus panel 90 degrees. Cold water should now flow out of the hot water faucet (since it is bypassing the heater).

If your 337 is similar to my 315's plumbing (and the Nautilus is the same) this thread should help you understand: https://gdrvowners.com/forum/operati...abled-disabled

Finally, welcome to the forum! I hope you'll check out the Welcome Letter to New Members: https://gdrvowners.com/forum/main-fo...to-new-members

Howard

[marknuss710]

Yes, there's a check valve on the back of the hot water heater. Mine looks like this:



You can verify this is the issue by turning the red knob on the Nautilus panel 90 degrees. Cold water should now flow out of the hot water faucet (since it is bypassing the heater).

If your 337 is similar to my 315's plumbing (and the Nautilus is the same) this thread should help you understand: https://gdrvowners.com/forum/operati...abled-disabled

Finally, welcome to the forum! I hope you'll check out the Welcome Letter to New Members: https://gdrvowners.com/forum/main-fo...to-new-members

Howard

Thank you for the info. unfortunately bypassing the hot water heater didn't seem to make a difference in the flow.

[Yoda]

2020 337RLS Reflection with traditional hot water heater

Out of the blue, the hot water stops flowing. Cold water works fine.
Doesn't flow on "city water" or "dry camping" mode
with the Pump "on" the hot water will push water out of the heater tank pressure relief valve when opened.
I drained the hot water heater 2x and there's some reduced flow (60% -70% reduced)

Wondering if anyone knows if there's a check valve on the output of the hot water tank? Or other ideas that could be causing this issue?

Thanks

Are you talking about a specific faucet, or all the HW faucets? If it is a specific one, possibly the faucet screen has plugged. One other thing to check and this may not be related to your issue - are both of your outside shower valves closed. If thier open it can allow the water to mix. If this is not the case I would pull the check valve and replace as Howard mentions.

[Country Campers]

I would suspect the check valve in post # 2.

Brian

[TedS]

Set the Nautilus valve to bypass the water heater. If water flows out the hot faucet, then the problem is a stuck check valve on the water heater outlet.

[howson]

Thank you for the info. unfortunately bypassing the hot water heater didn't seem to make a difference in the flow.

So to clarify, you turned the red knob on the Nautilus panel 90 degrees and there's no difference in the flow of water from the hot faucets?

Can you expound further on the problem (as Keith suggested): is it all the hot water faucets in the trailer?

[marknuss710]

So to clarify, you turned the red knob on the Nautilus panel 90 degrees and there's no difference in the flow of water from the hot faucets?

Can you expound further on the problem (as Keith suggested): is it all the hot water faucets in the trailer?

Initially - No hot water flow on all locations (outside shower spigot included).
Cold water flow was normal on all locations.
Have been in my current location for 2 1/2 months and this issue started out of the blue this morning.
I did bypass the hot water heater control valve ONLY on the Nautilus system and it didn't affect the flow.
Filled and flushed the hot water heater 2x and there was some flow out of the hot water position (all spigots) but only 30% or so from normal.
I did go into the full "winterize mode" on the Nautilus and the hot water location flowed normally in ALL locations.


Removed what I thought was a check valve and it was merely a plastic nipple.

Im stumped

[howson]

Initially - No hot water flow on all locations (outside shower spigot included).
Cold water flow was normal on all locations.
Have been in my current location for 2 1/2 months and this issue started out of the blue this morning.
I did bypass the hot water heater control valve ONLY on the Nautilus system and it didn't affect the flow.
Filled and flushed the hot water heater 2x and there was some flow out of the hot water position (all spigots) but only 30% or so from normal.
I did go into the full "winterize mode" on the Nautilus and the hot water location flowed normally in ALL locations.


Removed what I thought was a check valve and it was merely a plastic nipple.

Im stumped

Look at the diagrams posted in the Plumbing channel's Reference Material section (post #2 of this thread): https://gdrvowners.com/forum/operati...el-information

When you're in the Winterize mode, the flow inside the Nautilus is bypassing the blue handle's valve and the hot water heater.

Humor me--set the Nautilus panel to the Winterize settings but rotate the red knob so it's pointing up (allow water to pass through the water heater). What's the change in the flow, if any?

Note I'm assuming your Nautilus settings match the v1 drawings. If your panel is different, let me know. (Should still have a red knob, though, so you can still set to YOUR winterize settings but engage the water heater.)

IMPORTANT: No power to the water heater element ( and don't turn on propane to the heater, either). Leave them off during troubleshooting. If the tank should drain inadvertently, you'll toast the electric element or damage the liner. (Sorry--that may be self-evident but want to be overly cautious.)

[marknuss710]

Look at the diagrams posted in the Plumbing channel's Reference Material section (post #2 of this thread): https://gdrvowners.com/forum/operati...el-information

When you're in the Winterize mode, the flow inside the Nautilus is bypassing the blue handle's valve and the hot water heater.

Humor me--set the Nautilus panel to the Winterize settings but rotate the red knob so it's pointing up (allow water to pass through the water heater). What's the change in the flow, if any?

Note I'm assuming your Nautilus settings match the v1 drawings. If your panel is different, let me know. (Should still have a red knob, though, so you can still set to YOUR winterize settings but engage the water heater.)

IMPORTANT: No power to the water heater element ( and don't turn on propane to the heater, either). Leave them off during troubleshooting. If the tank should drain inadvertently, you'll toast the electric element or damage the liner. (Sorry--that may be self-evident but want to be overly cautious.)

So I reassembled the system (with the original plastics nipple) and I now have full flow on the hot water side, all locations.
These phantom issues will drive me crazy.

[howson]

marknuss710 -- it's all good if it's working.

Now that you have time, don't forget to check out the Welcome Letter and fill out your signature line.

https://gdrvowners.com/forum/main-fo...to-new-members

Howard

[ncitro]

marknuss710 is it possible a hot line froze? If you're somewhere cold and it froze I could see it not working even if the heater was bypassed, as well as it starting to work on its own after it thawed.

[marknuss710]

marknuss710 -- it's all good if it's working.

Now that you have time, don't forget to check out the Welcome Letter and fill out your signature line.

https://gdrvowners.com/forum/main-fo...to-new-members

Howard

Thank you for the help. I’ll check it out later tonight after I fix the small leaks from the wonderful fittings GD uses. Thanks again for the assistance

[marknuss710]

marknuss710 is it possible a hot line froze? If you're somewhere cold and it froze I could see it not working even if the heater was bypassed, as well as it starting to work on its own after it thawed.

Sunny Phoenix 🌞

[ncitro]

Sunny Phoenix 🌞

Wishful thinking the cause would be that easy.