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Thread: shower water temperature fluctuation problem

  1. #1
    DIY Junior Member dayexday's Avatar
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    Default shower water temperature fluctuation problem

    hello, i'm having a problem with my water temperature when I shower. Whenever I turn the shower on, even at a low pressure, the water temperature will go from from hot to cold to hot without reason. it seems to be related to the water pressure b/c when it gets colder, the water pressure increases slightly even though I'm not turning the controls. the fluctuation gets worse if I turn the water on all the way so I can't use the shower at full blast.

    Any ideas what needs to be done?

    Thanks in advance for the help!

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Can you post a picture of the shower valve?
    New valves come pressure balanced. If you have old piping and the old non-balanced valve, then adding an expansion tank helps with pressure swings.
    If you have a pressure balanced valve and the temperature is changing, then you may need some work with the cartridge.

  3. #3
    DIY Junior Member dayexday's Avatar
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    Thanks so much for the reply Terry. It's the 11th floor of a building built in 1983. Any idea what the work would entail, how long etc, and about how much it would cost? Thanks in advance


    I attached some pictures but not sure they came out so here are links:
    http://www.flickr.com/photos/2916114...in/photostream
    http://www.flickr.com/photos/2916114...in/photostream
    http://www.flickr.com/photos/2916114...in/photostream

    Thanks again
    Last edited by dayexday; 07-05-2012 at 06:15 AM.

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    DIY Junior Member dayexday's Avatar
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    i have old valves so I'm thinking I should have pressure balanced valves installed. Would you know if that require putting a hole through the wall and what that process entails? Thanks again

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    Forum Admin, Expert Plumber Terry's Avatar
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    Moen has a remodel plate for their Posi-Temp tub/shower valve. You cut the tile from the supplied template and that gives enough space for a plumber to get in there and change it.

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