Moen Posi-Temp Shower Faucet

Discussion in 'Shower & Bathtub Forum & Blog' started by ptim, Nov 7, 2012.

  1. ptim

    ptim New Member

    Nov 7, 2012
    Very much a noob here. I have a Moen shower faucet, that has an issue, when you turn the water on, start spinning right to left, going through cold water, then into hot, as it starts its fine, but when it gets half way, the water get slower coming out, and the handle kinda gets easier to turn, almost like it gets loose. I took the handle off, but not all the way, to the valve, the plastic parts look fine, could the valve be bad.

    Plus its starting to leak.
    Last edited: Nov 7, 2012
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Most shower valves don't do just cold, but may get to all hot. So, you've got water coming through from both the hot and cold supplies but when you get closer to the hotter end, you start to shut off the cold. Using both supplies will produce more potential volume than just one (in this case the hot).
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  4. Towers Plumbing

    Towers Plumbing In the Trades

    Nov 13, 2012
    Salt Lake City, UT
    Sounds like a Moen positemp valve cart 1222. That cart has a ball that moves back and forth depending on pressure to keep the water at the same temperature. Overtime, if the valve is not used alot, the ball can stick. This creates the effect you are describing. Sometimes taking out the cartridge and slamming it on a counter top can break the ball free, then use a silicone spray to keep it lubed or you can call Moen and get a new cart.

    Last edited by a moderator: Nov 13, 2012
  5. chopped

    chopped New Member

    Oct 20, 2012
    New England
    Not to Hi Jack this thread but I found it after posting mine.A quick question for me is there a NON temp valve replacemtn for this? Thanks..
  6. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego
    No. The Positemp was the improved version of the older non-pressure-balanced, "pull-out" Chateau. But NONE of the parts are not interchangeable and it would be a code violation to take out the posi and replace it with an old style valve.
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