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Old 09-14-2012, 06:58 PM   #1
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Water heater - no water flow

We have a 2004 country coach motor home. I drained the hot water tank and refilled. I now have no water coming out of the hot water faucets. Theirs is water in the water tank and the water pump is working. No water comes out of faucet when turned to the hot on either shore or tank water. One more thing is that when all faucets are closed and running on water pump from tank, the water pump does not shut off.
Any ideas?
Thanks!
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Old 09-14-2012, 07:06 PM   #2
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If the pump stays running wait 5-10 minutes, it can take that long to re-fill the heater.

If you still get no water out, then a question, do you have a single bypass valve or 3 of them, and did you mess with it/them?

If you have a single then it is for sure you have a check valve in the water heater outlet pipe, this valve can "Gunk up" (Lime or calcalum or other minteral deposits) and refuse to open, Some of them can be easily removed, others gutted, but those is the #1 issue with "heater has water but no water at faucet" problems. (Bypass valve and check valve).
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Old 09-14-2012, 07:06 PM   #3
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Maybe you have some kind of air bubble in your pump, or did you possibly turn the hot water off at the bypass? Are you sure you have water in the fresh tank? Enough to refill the hot water tank? It will take a while to fill the hot water tank, maybe your pump is running to fill the hot tank. Did you open a faucet to let the air out as the water heater fills? In the spring it takes some time to fill the water heater. Good luck.
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Old 09-16-2012, 09:37 AM   #4
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If the water pump runs continuously, then it is unable to build pressure in the lines. That often means the "tank fill" valve is open and the pump is merely pumping water out of the fresh tank and right back into it again. If that's not it, then it may mean a clogged intake screen on the pump (cannot get water from the tank).

If there is no water pressure in the system, you won't get water form the hot tank, so solve the pump problem first. If still no hot water but the cold works fine, then you have a problem with the water heater bypass valves, which in many rigs includes a check valve that can get jammed or clogged. Or maybe one of the valves is just set in the wrong position.
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Old 09-18-2012, 07:01 PM   #5
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Thanks everyone, it ended up being the check valve was stuck.
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Old 10-27-2012, 04:40 PM   #6
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Low Flow Hot Water

Where are the location of check valves for the water system for 2003 Winnebago Sightseer 30 B?

Thanks

garry
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Old 10-27-2012, 05:06 PM   #7
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Quote:
Originally Posted by garryjay
Where are the location of check valves for the water system for 2003 Winnebago Sightseer 30 B?

Thanks

garry
If you are talking about check valves in the entire system, your question would be better asked in the Winnebago forum.

For the water heater, they are generally right at the tank on the inbound and outbound lines. They are about 2 1/2 inches long and not much larger than the water line.
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Old 10-27-2012, 05:07 PM   #8
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The check valves for the heater bypass system (single valve bypass control) are always right at the heater tank, where the hot water leaves the tank. Plus another where the cold comes into the tank, but that one seldom gives problems.
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Old 10-27-2012, 05:31 PM   #9
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Quote:
Originally Posted by garryjay View Post
Where are the location of check valves for the water system for 2003 Winnebago Sightseer 30 B?

Thanks

garry
Garry, you can download the plumbing schematic at Plumbing Diagrams just click on your year and model.

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