why is everyones answer to a simple cheap problem buy a new shower,
do you buy a new car when the tyre gos flat ?
if your not sure how to check the fault then don't give bad advice.
first check your switch cartridge is working ok just cause the switch on front panel is turned to off don't mean the cartridge is not faulty.
does the water go cold when you think you have turned it off ?
if not the cartridge is faulty.
also check the solenoid valve it should give a 3.4 ohms or above if below its faulty.
hi-spec plumbing & heating (essex)
September 2008