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Thanks: Just checked this and there appears to be no voltage at the flow switch. What can cause this?

Yes, thanks, I read the manual and saw that this was the meaning of the lights. I've tried all 4 taps fully open, and the shower. The flow seems to be fine.

The Green light comes on continuously for a while, then goes back to on for one second, off for four seconds, then comes on continuously for a while, back to flashing, and so on. The Red light never comes on.

My Vokera Aqua Nova water heater is not working properly: when I turn on a tap the water slowly gets hotter to about 45 deg C then goes cold then gets hotter and so on. I can hear a switch clicking in the unit as it is doing this. If I turn the tap off the unit's fan continues running for a...