Mira Sport Airboost Power Button Flashing

[lawrencek]

When I stop the hot shower, the button fades and then flashes. It was OK after I changed the black water control module. The solenoid stops at once (I can hear it) but the light fades as usual and then flashes. I need to reset the mains switch. Could it be the circuit board? I have made sure that the plastic clamp for the PCB and module is not interfering with the switch at the bottom left of the PCB.

Thanks

Lawrence