Grohe Thermostatic Shower Valve - No "Off" Position

Discussion in 'Shower & Bathtub Forum & Blog' started by Nonlinear, Jun 6, 2020.

  1. Nonlinear

    Nonlinear New Member

    Joined:
    Jun 16, 2017
    Location:
    Toronto, Ontario
    We just renovated a bathroom with Grohe shower components (19988001 thermostatic shower valve, 35026000 rough-in). I've attached a picture of the rough-in installation.

    When the shower valve was installed and the water was turned on, there was no "neutral" position where the water could be shut off. There would either be a decent amount of water coming out of either the overhead shower of the hand shower no matter where the adjustment lever was pointed.

    Our contractor said the cartridge was bad, so I called Grohe and they send me a new one within a week. With the new cartridge installed it is 99.5% fixed, but unfortunately there is still a very very slow dribble of water out of the hand shower when the adjustment lever is in the neutral position.

    Does it seem possible that two brand new cartridges would have this problem? I'm worried that there is something wrong behind the walls, but with my low-level understanding of the rough-in box I can't understand how that could be the problem.

    Any advice is appreciated.
     

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  2. Marlinman

    Marlinman In the Trades

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    Last edited by a moderator: Jul 12, 2020
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  4. Nonlinear

    Nonlinear New Member

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    Jun 16, 2017
    Location:
    Toronto, Ontario
    I believe that trim kit is for an overhead shower only, we have both an overhead shower and a hand shower.

    Our problem is that when the "water direction" lever is put to the 6 o'clock position there should be no water going to either the overhead shower or the hand shower, but this is not the case. The temperature lever seems to be working fine.
     
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Retired Systems engineer for defense industry.
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    New England
    On some of the Grohe volume/diverter cartridges, there's a very fine adjustment you must perform to get it to not provide water to either of the outlets. The system has splines on the shaft, you may need to move it slightly to the next notch to get it to stop flowing when it is in the 'off' position. On the one I have, it took a few trials to get it right when I replaced it. The original one lasted about 15-years before it started to drip a little. They're not cheap, and Grohe doesn't give out new cartridges for devices that old like say Delta does as they consider that normal wear, not a defect.

    On the one I have, it is a tub/shower volume control/diverter. The stop allows you to turn it to the tub spout without doing anything...to get it to the shower, you turn it the other way after pressing in the button for the stop.
     
  6. goda

    goda New Member

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    Sep 28, 2020
    Location:
    Mississauga
    I am facing a similar issue with a newly renovated bathroom with the same rough-in (35026000) but using a different thermostatic shower valve (19947000) - a slow dribble of water is coming out of the HEAD shower (not the hand shower like in your case), when the lever is in the off position.

    I've tried emailing and calling Grohe but have not been able to get ahold of them. Can you let me know how you managed to get in touch with them and have them ship you a new cartridge?

    This is my 3rd installation with the same rough-in and valve. The first one was also having issues and was able to replace it (7-8 years ago). The second one worked fine, so it seems it's a hit and miss with these cartridges.
     
  7. goda

    goda New Member

    Joined:
    Sep 28, 2020
    Location:
    Mississauga
    The splines are in their notches when the handle is in the 'off position' yet the shower head still leaks slightly. I've even moved the lever slightly to the hand shower open position (few mm), and the head shower still leaks.

    Can you elaborate on what valve you have and how you performed the adjustment?
     
  8. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    The volume control on mine has a stop on it. You can turn the volume up and it comes out the tub spout. If you turn it back to the stop, the water stops. If you want to use the shower, you have to press in a button that will let you then turn that same volume knob the other way beyond the stop and the water comes out the shower head. The knob's stop position is controlled by a cam, and that came fits on the shaft that has notches, so you can adjust where it literally stops. Finding the sweet spot between tub and shower took a few trials. Your valve uses a different control, so I don't know how it is supposed to work.

    If you do not have the instructions, call Grohe and they can email you an electronic copy.
     
  9. goda

    goda New Member

    Joined:
    Sep 28, 2020
    Location:
    Mississauga
    Thanks for clarifying. I've had a real difficult time getting ahold of Grohe here in Canada. Have called them multiple times, left voicemail, and sent emails with full details on the problem and no response so far...disappointing. Will keep trying.
     
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