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Old 05-25-2012, 11:21 AM   #1
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no hot water coming out of water heater

I have no hot water coming from my water heater. The water is hot but does not flow through the lines. it has a one valve bypass kit installed by Winnebago at the factory. It has all plastic lines. Any suggestions?
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Old 05-25-2012, 11:28 AM   #2
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Do you have water pressure in the system? Cold water pressure? If you do then, if there is nothing to "push" the hot water out there will be no flow from the water heater, your rig may be equipped with a one way valve on the cold water inlet hose that has failed. These failures are quite common and the valve is usually less than $10.00 at Camping World.
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Old 05-25-2012, 11:46 AM   #3
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Does water from the water heater go to a manifold? If so, perhaps a valve has been closed. Interesting that water somehow flowed into the tank to be heated.

With the heater off, water pump on, open the pressure relief valve on heater and see if water flows that far. Also make sure outside shower has both faucets closed, this can cause water to mix.
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Old 05-25-2012, 06:42 PM   #4
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Possibly a stuck check valve at the back of the water heater.
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Old 05-25-2012, 07:23 PM   #5
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Do you have an outside shower? If either of those valves are open you will not get hot water.
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Old 05-26-2012, 07:11 PM   #6
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The Winnebago water system is notorious for stuck check valves in the bypass system. The valves are where the tubing enters and leaves the heater. It is a very common problem if the RV is used in areas with hard water, which is a lot of the USA.Especially in rural campgrounds.
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Old 05-27-2012, 11:27 AM   #7
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Hot Water

Thanks for all the responses. My problem has been fixed. It seems I had pressure build up in the tank. I released the pressure with the pressure eleif valve and I am good to go.
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Old 05-27-2012, 12:06 PM   #8
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Why wouldn't opening the hot water valve at the sink release the pressure? Not sure I understand the fix, or maybe the problem.
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Old 05-28-2012, 11:50 AM   #9
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Opening the relief valve should be no different than opening a faucet - both relieve pressure. But if the check valve I mentioned previously is stuck closed, opening a faucet won't let water flow, while opening the relief on the tank itself will. My guess is that relieving the tank pressure let the check valve bounce back enough to free it up. If that's the case, it will almost surely stick again before too long.
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Old 05-30-2012, 09:58 AM   #10
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No hot water

You were right, the problem happened again. You say the check valve is in fiting where the hot water line leaves the tank?
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Old 05-30-2012, 12:44 PM   #11
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Often when this happens, the outside shower has both valves on, but the head shut off with its valve, allowing the hot water to run in circles...
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Old 05-30-2012, 02:30 PM   #12
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Quote:
Originally Posted by J. Ingram View Post
You were right, the problem happened again. You say the check valve is in fiting where the hot water line leaves the tank?
Winnebago one valve systems use two check valves, one on the inlet and one on the outlet. Often they are screwed right into the water heater. They look like brass fittings and at first I didn't realize they were check valves.

This is a drawing I made of the system:

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Old 05-31-2012, 11:16 AM   #13
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Water Heater

Thank you for your input. I found the check valve at the water heater came apart. Removed it and all is good to go. I have been plagued with low pressure from the hot water. This also took care of that problem.
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