very slow temperature change cold to hot
I absolutely agree it sounds like a sticking Cartridge
Strip the cartridge out and soak it in vinegar for a fewhours refit it and cycle it back andforth between fully hot and fully cold 30 or 40 times if this doesn’t releaseit then you are going to need a new cartridge.
http://www.showerdoc.com/bristan-thermostatic-cartridge-cart-5
Answered 9 years ago by The Shower Doctor
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