Leaking Grohe Grohtherm 1000 Temperature Control. New shower could be installed within a month. How should I fix this without throwing away $300?

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Narshe9999

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Hello!
This installation is about 20 years old now, and this is the first problem I've had.
It leaks whether the shower is running or off.
It leaks whether the temperature control knob is turned hot, cold or in between.

It has been leaking for 2 weeks. And the leaking is getting a lot worse.
I've held off on the fix because I should have a whole new shower being installed, as I arranged with my bathroom company back in September.
However, they say it could be another month or two until the parts are in stock.
The leak was originally just cold water, but today, it has decided to become hot water... So I feel like I need to fix it now.

I believe it is the "1/2" Reversed Thermostatic Cartridge" that needs to be replaced (thanks to lurking your forum!)
However, the replacement part costs $300 CAD
(https://www.grohe.ca/Rough-Valve-Sp...-Thermostatic-Cartridge/GROHE-CHROME-47657000)

For a shower that could be replaced in a few weeks, that seems awfully expensive.

Is there a way I could fix it temporarily?
(I do not have dedicated shut off valves for this shower or bathroom. My wife would kill me if I asked her to turn on the main water valve each morning before she prepares for work)
 

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Narshe9999

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Also, how do the integrated "stops" work?
They look like they have a threaded hole in the middle of a larger hex-nut body?
What would I need to do to these things to turn off the water?
 

breplum

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The stops take a metric 8mm hex key. Get one. They each screw in to stop flow.
Grohe sort of has a lifetime warranty. It isn't really supported anymore, but you could call, especially if you had a receipt.
They sometimes do a 'one time' exception if you gently crank about the lifetime warranty.
 

Narshe9999

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The stops take a metric 8mm hex key. Get one. They each screw in to stop flow.
Grohe sort of has a lifetime warranty. It isn't really supported anymore, but you could call, especially if you had a receipt.
They sometimes do a 'one time' exception if you gently crank about the lifetime warranty.
Hello Breplum, thank you for your response.

By 8mm Hex key, do you mean to say that an 8mm hex key can fit into these small holes, catch, rotate righty-tighty, and that will shut off the water?
 

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Narshe9999

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My schematics paper seemed different from what I actually have in the wall, so I took a look around the internet and found this one... Which looks much more like what I have (also a Grohtherm 1000, but different?)

Does this appear to have water stop controls on it?
 

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