my shower is difficult to turn on and off and when it is on although the hot water pipe is hot the shower is cold. it seems to be letting to much cold water through. can i repair it?

mikey, April 2009

Turn shower control to maximum setting. Remove cap/cover on head assembly. Insert 2.5mm hexagon allen key into centre of valve head. Turn key anticlockwise to increase temperature, or clockwise to decrease temperature. Remove key and turn on mixer to check temperature.

Butch Marshall, April 2013