Stiff thermostatic shower mixer

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19 May 2025
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The temperature control on my shower mixer has got very stiff. Is there any way to fix this?

r/DIYUK - Stiff thermostatic shower mixer
And while we're at it, this cap keeps falling off, how to best secure it?

r/DIYUK - Stiff thermostatic shower mixer

 
Silicone spray may free it up. Depends where it binding.
A little clear polymer grab like CT1 or the cheaper Stixall with hold cap on
 
Usually when the thermo valves start to tighten it means they are getting worn. They can be stripped down, cleaned and greased but they invariably go back to stiff again as the brass internals and seals are worn and don't run past each other as easily now.

Might be time for a new one, unless you know the make of the bath mixer and they do replacement valves for them and they're not too expensive.
 

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