A: You have a faulty solenoid.
If when you switch off the shower at the main isolator and the shower keeps running then you have a faulty solenoid.
When you switch off the shower at the main isolator and the water stops running, then you have a faulty on/off switch or a faulty PCB or a micro switch that is sticking on.
http://www.showerdoc.com/shower-spares/triton/TRITO-PARENT-8-Triton-T70si
Answered 317 days ago | The Doc