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Old 05-22-2011, 08:23 PM   #1
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No Shower Hot Water

We're taking our first shakedown trip in our 2008 International and discovered that the shower isn't getting hot water. The galley and bathroom hot water are fine. What should we be looking for? We opened up the wardrobe panels to look at the plumbing, and also under the exterior and didn't see anything conspicuous, but we're no plumbers.
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Old 05-22-2011, 09:42 PM   #2
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I would suspect a bad or clogged shower faucet. Unless you can find a shut off valve in the hot water line to the shower. I'm not sure if they install shut off valves or not in a 2008.

Can you post a picture of the faucet? Then we can probably help you open it up so you can see if there's any gunk in it.

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Old 05-22-2011, 09:47 PM   #3
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Quote:
Originally Posted by KerriO View Post
We're taking our first shakedown trip in our 2008 International and discovered that the shower isn't getting hot water. The galley and bathroom hot water are fine. What should we be looking for? We opened up the wardrobe panels to look at the plumbing, and also under the exterior and didn't see anything conspicuous, but we're no plumbers.
Is the cross over valve closed? It is near the hot water heater.
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Old 05-22-2011, 10:09 PM   #4
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A Long Shot

The Moen valves in the shower control can be installed upside down. When this happens it will switch your hot and cold responses. If you turn it to cold you will get hot, if you turn it to hot you will get cold. This could be a long shot but you might want to give it a try.

If you open the shower valve in the cold position and the water is warm all you have to do is to rotate the valve 180 degrees. Other than that, I can't imagine a simple fix to your problem. If you have hot water at the other faucets I doubt your bypass valve is open.
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Old 05-22-2011, 10:11 PM   #5
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Once you check the cross over valve, try taking the shower head off and see if you can get hot water with no head.
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Old 05-22-2011, 10:47 PM   #6
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No hot water in shower, only.

Hi, this is quite common. Mine did it and I replaced the Moen cartridge. This fixed it and it never happened again. I originally removed , disassembled, and cleaned the entire valve assembly and cartridge even though I never saw any dirt or broken parts in it, but it still wouldn't work. So as I said, I replaced it. I heard that Moen will send you another one for free, [warranty] but it was easier to just go to Home Depot and buy one.
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Old 05-22-2011, 11:58 PM   #7
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Thanks, all. Sounds like it could be an issue with the Moen good to know just what to look for (or ask for if it's broken), so thanks RobertSunrus.

Just in case, I'm posting photos of both the faucet and the pipes around the hot water heater. Is one of these the crossover valve? The one where the red and white pipes intersect?
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Old 05-23-2011, 07:04 AM   #8
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Quote:
Originally Posted by KerriO View Post
Thanks, all. Sounds like it could be an issue with the Moen good to know just what to look for (or ask for if it's broken), so thanks RobertSunrus.

Just in case, I'm posting photos of both the faucet and the pipes around the hot water heater. Is one of these the crossover valve? The one where the red and white pipes intersect?
Yes the vertical valve is the crossover valve. It is closed.
Hot and cold valves to the hot water heater are open.
Do you get normal function from other faucets?
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Old 05-23-2011, 03:34 PM   #9
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Yes, the other two faucets get both hot and cold. Should the crossover valve be closed or open? We tried turning it the other direction last night (opening it), and we still didn't get any hot water in the shower, so we turned it back to the way you see it in the photo.

Is the crossover valve supposed to be closed or open?
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Old 05-23-2011, 03:57 PM   #10
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closed. it is only open when winterising. moen is quite quick about sending replacememt parts, so if you have a bit of time call moen and save the money.
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Old 05-23-2011, 03:58 PM   #11
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Your picture of the by-pass hot water heater valves show the correct valve settings to allow cold water to enter the water heater to be heated and sent on to the sink/shower in the camper. The valve handle shows which ones are open and which are closed - those with the handles parallel to the pipe are open and the one that is perpendicular to the pipe is closed. You turn the two on top and bottom to the off (perpendicular) position to drain the HW heater to winterize the trailer and the other one on to bleed the lines of water (by-pass valve).

My bet is the Moen valve need replacing - there is a ceramic disk that can crack very easily. Have time? get Moen to replace it free - need it now? Home Depot has them.
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Old 05-27-2011, 12:10 PM   #12
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Thanks for all of the information. I'm glad I now understand how the water heater plumbing works, even though I doubt it's the problem. We went ahead and bought a new cartridge so we could install and test before we put it back int storage. But the old cartridge is stuck in there really tightly, and we didn't have enough supplies to get it out. The little plastic little plastic piece that allows you to twist the old cartridge (that comes with the replacement) broke. The plastic tab on the original cartridge broke when we tried to pry a little. We'll be going back and spraying in some limeaway (internet suggested vinegar, but I think this needs something even more heavy duty), and let that work on it for a while and hopefully loosen things up. We're trying to avoid pulling out the inner core while the outer shell is still stuck in there, which, according to all of the hits on the internet, seems to happen a lot. You guys made this sound so easy!
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Old 05-27-2011, 12:46 PM   #13
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Did you remove the horse shoe clip?

Quote:
Originally Posted by KerriO View Post
Thanks for all of the information. I'm glad I now understand how the water heater plumbing works, even though I doubt it's the problem. We went ahead and bought a new cartridge so we could install and test before we put it back int storage. But the old cartridge is stuck in there really tightly, and we didn't have enough supplies to get it out. The little plastic little plastic piece that allows you to twist the old cartridge (that comes with the replacement) broke. The plastic tab on the original cartridge broke when we tried to pry a little. We'll be going back and spraying in some limeaway (internet suggested vinegar, but I think this needs something even more heavy duty), and let that work on it for a while and hopefully loosen things up. We're trying to avoid pulling out the inner core while the outer shell is still stuck in there, which, according to all of the hits on the internet, seems to happen a lot. You guys made this sound so easy!
Hi, did you remove the horse shoe clip? It won't come out with out removing this clip first. [cartridge] Mine is in the wall area and I have to remove the entire valve assembly to remove the horse shoe clip on mine. Others stated that they can remove this clip with the valve in place.
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Old 05-27-2011, 02:56 PM   #14
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Yes, we did do that. It was pretty much even with the wall area — too far in to remove with pliers, but we were able to get a flat screwdriver in there to loosen it, and then remove it with our fingers. It seems to be stuck because of grimy buildup —*which looks like it happens a lot to these.
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