Hi The shower had a small leek so I turned off the mains water to fix it and when I turned the water back on to try the shower the water would not stop running even with the power off.?
Solenoid valve is stuck open
Likely there is dirt in the diaphragm hole
You need to remove and check the solenoid valve
First try turning the mains water on slowly to see if the solenoid will shut off by itself
