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Thread: Grohe shower head will not shut off with tub filler

  1. #1
    DIY Junior Member rspage's Avatar
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    Default Grohe shower head will not shut off with tub filler

    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?

  2. #2
    Moderator & Master Plumber hj's Avatar
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    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.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member rspage's Avatar
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    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" ?

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    I did use PEX from valve to a drop ear elbow
    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



    Grohe rough for a slip-on spout



    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 by Terry; 08-23-2013 at 04:35 PM.

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
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    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.
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    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    Moderator & Master Plumber hj's Avatar
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    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.
    Licensed residential and commercial plumber

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