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Nope, the selector switch works perfectly. Here's a load of other stuff I've tried to no avail: Any advice would be greatly welcome. I know that the central heating thermostat knob potentiometer thing on the front works because i've unsoldered it and the hot water one and tested them...

Thanks. Will do.

Hi I have a Baxi Combi Instant 105e. The hot water preheat function works, and so does the normal hot water function when you turn on the tap. You can hear the pump starting up, the clicking of the diverter valve, and clicking on the spark and the lighing of the flame. It then heats up the...