very slow temperature change cold to hot

Our PISA shower is 11 years old. It has a fault where the water temperature doesn't immediately change when altering the water mix. When changing from a cold mix to hot, it can take 3 minutes+ for the water to change temperature; or not at all. Hot to cold is generally much quicker. It the water mix is rapidly cycled cold to hot and back again, then the temperature can be altered more reliably if then stopped on hot! So, it would appear that the temperature mix mechanism is sticking in the mixer cartridge; what's an expert view?
Asked 9 years ago by Anonymous

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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