if you mean you have water coming from the handle part of the shower (this is the mixing valve), then it needs removal and repair. could be anything wrong, but its usually the front seal on these cartridges. this unit looks like it has the diverter in the mixing handle, so the whole unit probably needs repair.

if you mean the water comes from a tub filler spout with a diverter valve in it (the little pull or twist handle that selects shower instead of tub filler), then the tub filler probably needs servicing or replacement. most of them are less costly than replacement parts for the same unit

Answer from personal privacy advocate on Stack Exchange
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JustAnswer
justanswer.com › plumbing › nu2gl-grohe-diverter-valve-470689-hard-pull.html
Grohe Diverter Valve Troubleshooting: Fixing Stiff Operation
Diverter valve sticks when switching ... hard to pull or won’t return, first try applying a silicone-based lubricant around the valve stem and inside the cartridge area....
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Amazon
amazon.com › grohe-valve-Bathtub-Shower-Diverter-Valves › s
Amazon.com: Grohe Valve - Bathtub & Shower Diverter Valves / Household Rough Plumbing Valves: Tools & Home Improvement
Bathtub & Shower Diverter Valves · Brands · GROHE · Customer Reviews · 4 Stars & Up · Condition · New · Price · Up to $35 · $35 to $80 · $80 to $100 · $100 & above · Deals & Discounts · All Discounts · Valve Type · Shower Flow Control · Bathtub & Shower Diverter ·
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JustAnswer
justanswer.com › plumbing › sjcl8-grohe-passport-series-diverter-valve-removal.html
How to Remove Grohe Diverter Valve: Expert Replacement Guide
To replace the Grohe 45443000 diverter valve, first shut off water supply. Remove the handle by carefully extracting the stripped set screw—use a screw extractor if needed. Then, unscrew the valve body from the tub assembly; penetrating oil ...
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Reddit
reddit.com › r/plumbing › help with grohe shower diverter
r/Plumbing on Reddit: Help with Grohe shower diverter
February 27, 2021 -

My Grohe shower diverter started acting up yesterday. When I pull the plug to engage the diverter, I get zero flow coming out of my shower head and the water stops pouring out of the faucet at the same time.

I couldn't find a part number for this style of faucet, so I wasn't really able to find a manual online for it. The furthest I got when tinkering quickly with it was that the round part of the cap unthreads. Then there's a smaller nut underneath. Didn't want to attempt anything without asking first 😅

Anyone ever install or repair one of these? Looking for some help fixing this so I can get the shower working once again.

Find elsewhere
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JustAnswer
justanswer.com › plumbing › q642i-waiting-someone-answer-question-its.html
Fixing Grohe Essence Shower Diverter: Q&A Guide
Replacing it with a new one should likely fix the problem. Check Water Pressure: Inadequate water pressure can also cause the diverter to fail in switching functions. Verify that your home's water pressure is sufficient by testing other fixtures.
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Reddit
reddit.com › r/diy › bath/shower diverter not working?
r/DIY on Reddit: Bath/shower diverter not working?
August 9, 2020 -

My tap in the bathroom has a pull up type diverter to change the water flow between filling the bath or going through the shower head. Recently, when I try to change from bath to shower, it does not do it completely, and I'd say half the water still goes through the bath nozzle, the other half going through the shower head.

I do not have any experience with this, but I'm assuming either the diverter valve is worn out failing, or it is the spring?

My question is, what would be the most likely culprit? The tap I have is a GROHE CONCETTO TWO-HANDLED BATH/SHOWER MIXER ½″.

I also can't seem to get the bottom of the tap off. There is a ring at the bottom that I just cannot remove, no matter what I try.

Thank you in advance!

https://www.grohe.co.uk/en_gb/concetto-two-handled-bath-shower-mixer-1-2-25109000.html?product=25109-G187&color=000&material=25109000

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Faucetshark
faucetshark.com › Grohe-Repair-Parts-Guide-s › 6621.htm
Grohe Repair Parts Guide
Find Grohe thermostatic shower parts breakdowns and part identification by valve model · See More › · Grohe Volume Control Parts · See More › · Grohe Diverter Valve Parts · See More › · Grohe Centerset Lavatory Faucet Parts · See More › · Grohe Wideset Lavatory Parts ·
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Grohe
grohe.ca › bathroom-faucet-fittings-and-spare-parts › diverter › grohe-chrome-48023000
Diverter
Diverter
Find your perfect product using our Selector Tool
Price   $12.75
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Grohe
grohe.ca › bathroom-faucet-fittings-and-spare-parts › diverter-manual › grohe-chrome-48008000
Diverter Manual
Diverter Manual
Find your perfect product using our Selector Tool
Price   $81.00
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DIY Home Improvement
diychatroom.com › home › forums › home improvement › plumbing
1990s Grohe shower mixer valve repair questions | DIY Home Improvement Forum
Hi, I have a grohe mixer valve plumed in my shower and it is completely frozen. You can't change the temp. I pulled the handle off to expose the pictures below. What model valve is this and any tips on repair? I'm hoping it's a cartridge, but concerned its a rebuild. Any insight appreciated...
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Grohe
grohe.ca › diverter-valves-trims › 3-way-diverter-rough-in-valve-shared-functions › grohe-no-finish-29903000
3-Way Diverter Rough-In Valve (Shared Functions)
3-Way Diverter Rough-In Valve (Shared Functions)
Following are the list of products or parts which you can also add to your list along with the product, you can also download the parts diagram by clicking on the Download Repair Parts Diagram button
Price   $303.00
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DIYnot
diynot.com › home › forums › how to... › plumbing and central heating
How Do I Replace a Shower Diverter Valve? | DIYnot Forums
December 31, 2018 - Do i need any particular tools? as for the valve, i believe this tap is called a "Eurosmart" as per this link https://www.heatandplumb.com/acatalog/grohe-eurosmart-bath-shower-tap-deck-mounted-chrome-25105000 (though in google that name comes up w/ quite a few other pics too) so is that "silkmove 56mm cartridge" the thing i need to find and order? TIA ... Look at https://www.grohe.co.uk/en_gb/eurosmart-single-lever-bath-shower-mixer-1-2-25105000.html .
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PlumbersStock
plumbersstock.com › home › parts › faucet parts
Grohe - Diverter Parts & Accessories for Tub, Shower, & Bidet
Grohe - Find diverter parts and accessories for tub, shower, and bidet valves from top brands. Restore water flow and performance with genuine replacements.