Corrosion/hard water scale has built up between the slotted shaft and the handle .... "cementing" it in place.
A faucet handle puller may help depending on your design. This video shows how for a 2 faucet sink setup...but your 1 faucet handle should be similar. The puller will ONLY work though if you can access the end of the slotted shaft to get leverage from. Can you remove an end cap from the handle to access the shaft? ...
If the puller will not work ....
You could try penetrating oil (if you can get the oil to the corrosion) ... or if your handle is metal, cover it with a wash cloth to prevent marring and tap with a brad hammer. Sometimes that breaks the corrosion bond.
You could also try heat/cold/heat/cold by heating with a hair dryer followed by a bag of ice water and then repeat. The temperature cycling might help.
In a real pinch ... but you have to VERY careful ... use a pry bar between the escutcheon plate and the handle...go slow .... use cloth protection to prevent marring ... move the pry bar around and rock it....say at 12, 3, 6, 9 o'clock positions around the handle
AND .... when you are successful ... when you reinstall ... put some silicon plumbing grease on the shaft to prevent future corrosion!

Grohe Plumbing | Answered on Feb 06, 2019

1 Answer

Grohe Concetto Single Handle Pullout Kitchen Faucet leaking at base. How to fix?

REPLACEMENT MOST LIKELY

Grohe Plumbing | Answered on Dec 30, 2018

1 Answer

My Grohe kitchen faucet is leaking (spray pull-out). Where do I start?

google this you might find the answer or ask jeeves

Grohe Plumbing | Answered on Nov 20, 2018

1 Answer

Kitchen faucet makes high pitch noise and only a little water comes out. It is a pull out Grohe faucet with a hand sprayer. The amount of water that comes out varies. Water pressure is limited.

You usually can un-screw the hand sprayer, hold on to the hose! If there is more water coming out of the hose then you might have a plugged screen right inside the removed end or the total head is filled with hard water minerals. CLR at Walmart does desolve scale.with out hurting parts.

Grohe Plumbing | Answered on Nov 14, 2018

3 Answers

How do I fix slow drain brand new plumbing?

The drain pipe may not have been installed correctly - the slope may be wrong, or the pipe may be too small, or you may have too much backpressure, or if you have a septic tank it may be full and need pumping, or any number of other possible problems. You might have another plumber come for an assessment and opinion - make it clear that you don't necessarily intend to hire them to do any WORK, you just want their opinion. Then they won't try to sell you all new plumbing to replace what you just bought...

Grohe Plumbing | Answered on Oct 16, 2018

0 Answers

My Grohe Blue system is showing error code E3. I believe this means that no mains water is getting to the unit. I cannot see why this is the case. How do I check this?

Grohe Plumbing | Posted on Oct 15, 2018 | Be the first to answer

1 Answer

I need some parts for Grohe 32336000 tub faucet Eurodisc 3 pc Chrome

Grohe Plumbing | Answered on Oct 08, 2018

1 Answer

My grohe faucet is stuck on the stream spray and won't toggle back to normal water flow. I have the single faucet pull down.

Try to soak the head in white vinegar. Pull the head out and dangle in a glass full of vinegar overnite.

Grohe Plumbing | Answered on Oct 07, 2018

0 Answers

Grohe Ladylux 3 Cafe - the sprayer won't stay on.

Grohe Plumbing | Posted on Sep 24, 2018 | Be the first to answer

0 Answers

Grohe kitchen faucet aerator replacement

Grohe Plumbing | Posted on May 27, 2018 | Be the first to answer

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