Temperature issues with Bristan Pisa Shower

Hi

I have a bristan Pisa shower and basically when i turn the shower on it is boiling. when you turn it down to the required temperature it stays warm for a short while before going luke warm, even though there is hot water in the rest of the house. if you try and turn the shower up it won't go any warmer. I have a hot water tank and there is hot water coming into the shower on the pipe?

any ideas?

cheers


Ed

[uug197h]

Sounds like the thermostatic valve is at fault it should not get to hot that you have to turn it down and then when you have i sticks lower than you have set it