No hot water from shower/tub - Moen standard valve with Moentrol adapter/trim

Discussion in 'Shower & Bathtub Forum & Blog' started by phong, Jan 30, 2014.

  1. phong

    phong New Member

    Jan 30, 2014
    My contractor recently installed a Moentrol shower handle ( onto a Moen standard valve using the adapter ( This should work as straight pull-on/push-off, with 90 degrees left being full hot water and 90 degrees right being full cold.

    After the install, I'm barely getting any hot water. Turning left actually gives me freezing cold water, and turning right gives me maybe room temperature at best after waiting 10 minutes. The hot water from my sink is working - it doesn't get super hot, but warm enough when turned on full. I live in an apartment building. Any ideas what may have been wrong? I was searching online and read that maybe the cartridge was reversed, which will cause the flip in hot/cold. But how can I increase the hot water flow?

    Also, the handle is very tight - it takes me two hands and a bit of effort to actually pull the handle on. Will it loosen over time?

    Appreciate any advice!
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington

    That sounds like a reversed cartridge that needs replacement.
    A new one will be the fix on that.

    1 Check Stops Spring-driven gaskets at the valve inlets prevent high-pressure hot water from crossing the valve into a cold supply line or vice versa. (Hot water is at higher pressure in recirculation systems.) Screws in the stops shut off hot and cold lines at the shower for work on the valve cartridge.

    2 Pressure-Balancing Spool Hot and cold streams slide a graphite-composite piston in response to fluctuating hot and cold water pressure. In 0.1 seconds, the piston (inside the chrome sleeve) seals or opens inlets to maintain balanced pressure between the two flows, which are still unmixed. Lab tests to monitor internal movement show the piston constantly vibrating back and forth.

    3 Cartridge Pulling the shower handle slides the cartridge forward, opening two inlets to let hot and cold water enter and converge. Turning the handle opens one inlet as it closes the other, allowing users to adjust the temperature.

    4 Temperature Limit Stop Screwed into the cartridge's rod, this stop prevents a child from fully opening the valve to a scalding-hot setting
    Last edited: Aug 14, 2016
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  4. rjbphd

    rjbphd In the Trades

    Mar 6, 2016
    Chicago, Illinois
    Groans, how can the hot water be higher pressure in a recirulation system?
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    a pump
  6. rjbphd

    rjbphd In the Trades

    Mar 6, 2016
    Chicago, Illinois
    Guess you don't work with or on hydronic heating system
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