Grohe shower head will not shut off with tub filler

Discussion in 'Shower & Bathtub Forum & Blog' started by rspage, Aug 23, 2013.

  1. rspage

    rspage New Member

    Joined:
    Aug 22, 2013
    Location:
    Indiana
    Just installed a Grohe Eurosmart 19-913 tub & shower control.

    Whenever we use the tub filler, the shower head is on at half volume.

    Pulled out the mixing cartridge and reset it, but that has little to do with volume control and didn't help.

    The shower is controlled by a push-down knob on the tub filler. When we use the shower head, the tub filler is shut off and everything functions fine.

    But when we use the tub filler, the shower head is running continuously at half volume.

    Ideas?
     
    rspage, Aug 23, 2013
    #1
  2. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    You installed the valve upside down, you used PEX or some other plastic for the drop down to the tub spout, or the valve needs a "twin ell" and you went directly off the top of the valve, take your pick, but it should be one of these three, and most likely the last one from your description.
     
    hj, Aug 23, 2013
    #2
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  4. rspage

    rspage New Member

    Joined:
    Aug 22, 2013
    Location:
    Indiana
    The valve is certainly right side up.

    I did use PEX from valve to a drop ear elbow and then a galvanized nipple out for the tub spout.

    What the heck is a "twin ell" ?
     
    rspage, Aug 23, 2013
    #3
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    That WILL NOT work.
    PEX can't be used for tub spout piping.

    And chuck the galvanized while you are at it and go with brass. Unless you like a little rust first thing in the morning when you open the tub valve.
    The drop to the tub spout can be full size copper or nipples.

    NO CPVC, NO PEX

    [​IMG]

    Grohe rough for a slip-on spout

    [​IMG]

    Hansgrohe rough with a 3/4" drop ear that gets replaced with a 3/4" brass nipple.
    The hammer arrestors add nothing of value here. The valve is too slow closing for them to make a difference.
     
    Last edited: Aug 23, 2013
    Terry, Aug 23, 2013
    #4
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Grohe usually specifies you use a twin-ell to your showerhead from the divertor tub spout. Unless you threw them away, carefully read and review the pictures in the installation instructions.
     

    Attached Files:

    jadnashua, Aug 23, 2013
    #5
  7. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    The top opening on a valve is NOT always for a shower riser, (except for a shower only installation), unless the valve has a "restrictor" in the opening to prevent water from coming out of the head when the tub is filling. I do not believe ANY Grohe thermostatic valve has the restrictor.
     
    hj, Aug 24, 2013
    #6
  8. Tom Morgan

    Tom Morgan New Member

    Joined:
    Dec 12, 2018
    Location:
    Oregon
    Is the only reason you recommend not using PEX to tub spout due to water restriction? I'm doing a similar Grohe set up and plan on doing 3/4 PEX to tub spout using Uponor fittings, is there a reason this would not work?
     
    Tom Morgan, Dec 12, 2018
    #7
  9. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Any restriction smaller than 1/2" copper will restrict too much for the tub spout.
    If you have a 3/4" outlet from the valve, that would work, but be careful where you make a transition for the spout itself. Any reduction and water will be forced upward. And once it's tiled, you're sunk.
    Soldering is easy.
     
    Terry, Dec 12, 2018
    #8
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