Water constantly flowing through
If when you switch off the showerat the main isolator and the shower keeps running then you have a faulty flowvalve
When you switch off the shower at themain isolator and the water stops running, then you have a faulty on/off switchor a faulty PCB .
http://www.showerdoc.com/mira-flow-valve-assembly-components-identified-c-1643-149
http://www.showerdoc.com/mira-relay-board-and-earth-wire-406-88
Answered 11 years ago by The Shower Doctor
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