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Milo, I have got it sort of working OK now. Wish I could have cleaned the H and C water supply valve by taking them out, but I just flushed them as well I could.

Thanks for all your good help.
...

Milo I am back to the Shower Valve!

The Hot / Cold supply are indeed crudded up. I took the control screws out and sprayed some diluted vinegar solution in the two holes and left them to clean. I...

I think that I have a long way to go! I shall be out of town for three days. I spent most of the day getting things done before I leave and doing various odds and ends. I shall have to get back to...

Some Disturbing Observations

While the parts remained submerged in 10% [diluted] white vinegar solution overnight, I made the following observations.

With H & C waters turned off and the H &...

Here is the cartridge.

Now unscrew the cartridge, take large channel locks, grab it by the conical stem - and pull it out - straight towards you. It will have some resistance, since it sits on few stiff O-rings. Once you...

Got the rest of it out! Pic1, Pic2.

The brass nut thing is loose but it won't come out. The two screws on the wall, I suppose controls the cold and hot water volumes. They are rusty and could not...

PS: I messed up the image, how do I correct it? Thanks!

Success at last! The front ring is off! It really came off quite easy! May be it had softened down form the work over last night! Ant way, congrats Milo!
Here is the new problem ...

PS:

The bottom picture does show that the font ring is indeed mounted on slots!

Just in case: I hope you are doing all this work with water supply Turned Off... If not, than Turn water off.
I turn it off when I work on the valve.

Remove the front ring. See the blue arrow. ...

Can you snap clearer and closer photo ? also from 45 degree view ? Put your camera on Macro

Picture From Top See the screw.

Picture From Bottom Observe no screw in the screw tap!

I shall...

That conical part ( the middle of the stem) is your temperature control. You don't remove it. Leave it as it is.

It is still there. I tried to turn it count clock. After 1 1/2 turn it became stuck...

Look at #2 in exploded view. I think you did not remove that one. You unscrew it. That is what actually holds the entire cartridge in.
Handle screw is what you list in your last post under #2

I...

Your procedure, Milo, is close to GROHE Cleamup Procedure.

Can you tell me "What is the handle Screw?"


Integrated Grohmix clean out
1) Remove escutcheon screws rotate 90 degrees and with a...

Thanks for your attention Milo. I am sure that I am not doing it right!

1. Remove screw cap
You mean Pos. No. 1.1? - Done
2. Remove screw
You mean Pos. No. 1.2? - Done
3. Remove handle ...

I am worried about damaging it too. Never thought that it could be so tricky. Current GROHE folks are probably not old enough to have worked on this model! The initial installation was was probably...

It should be a 24mm deep socket!

Have you loosened the screw in the middle of the nut...that is another screw I see there...yes??
Yes, I have. After about 1 1/2 count clock turn it stops with no loosening!
Try that first. Then...

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Where do I click?

Yes, that is a bad picture! Here is a better one MARK.

I have also been busy. I contacted GROHE. Evan Thomas, in their SC identified the valve controller and sent me a cleaning procedure. Evan...

Whatever is in the very center of the handle... is it a chrome cap (?)... that needs to be pried up using a little flat screwdriver and that should reveal the screw holding the handle in place. ---...

Is this it?
Remove the handle: How?
Rest of the parts SPIN off counterclockwise: Shall try!
Thanks a lot!

I seem to have the same problem in one of my showers! I presumed that it was due to hard water crud but as I was unable to get to the guts of the plumbing, I have been not been able to do anything...