Showers turn cold after 30 seconds after installing a Delta valve without cartridge.

Discussion in 'Shower & Bathtub Forum & Blog' started by impreza276, Aug 20, 2019.

  1. impreza276

    impreza276 New Member

    Joined:
    Jan 8, 2018
    Location:
    Maryland
    I have two showers in the house 2 and 5 years old, both built by me. One uses a Moen mixing valve and the other a Delta mixing valve. Both worked fine until a week ago when the complaints about the showers turning cold or lukewarm began. The hot water to the sinks is still quite hot, though I can keep my finger under the running tap.

    In order to fix the problem quickly I replaced the Delta valve but that has had little effect. The only change in the system is that I have started building a third shower, which is further down the run from the other two showers.

    I am completely stumped by the problem. The shutoff valves are open and no debris from the new construction could have gone upstream into the other showers. My only guess is that it could be a water heater tank issue, such as a change in temperature that is tripping up both shower values. Any ideas?
     
  2. impreza276

    impreza276 New Member

    Joined:
    Jan 8, 2018
    Location:
    Maryland
    Hmm.. I think I have figured it out after reading the responses to "One of two showers uses ALL the hot water?". A dumb mistake that should take all of an instant to fix. Will report tomorrow. Thanks!
     
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    If you have the rough-in for that third bathroom, but did not install the cartridge yet, most designs will allow the hot/cold to cross-over. With Delta, you MUST install the plug to prevent that, or install the cartridge. Delta used to provide that plug, but from what I hear, it's now optional in most boxes.
     
  5. impreza276

    impreza276 New Member

    Joined:
    Jan 8, 2018
    Location:
    Maryland
    That was exactly it! I used the regular plug that allowed the hot/cold to mix. I solved the problem by closing the shutoffs for the new plumbing. At one point I was fearing that it could be my heater was dying.
     
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