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  1. #1
    Join Date
    Jul 2013
    Posts
    1

    Default Moen posi temp cartridge shower comes on without pulling knob on spout

    Why does my shower turn on in certain places as I dial in the temperature of the bath.? It happens before I even pull the knob on the tub spout !! I replaced the moen 1222 posi temp cartridge hoping for a solution. Not fixed. So frustrating. What do I do?

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,436

    Default Re: Moen posi temp cartridge shower comes on without pulling knob on spout

    Moen 1222 Posi temp is a pressure balance faucet. The water comes on when you rotate the handle left or right, not by pulling it out. No water flows when the handle points down.

  3. #3
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,183

    Default Re: Moen posi temp cartridge shower comes on without pulling knob on spout

    That will happen is PEX or CPVC pipe was used between the faucet and the tub spout. Both PEX and CPVE have a smaller OD than copper. I believe the instructions on the faucet have a warning about use PEX or CPVC.
    John

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