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My megaflo has a cold water combination valve (part no 95605 021) which is dripping. The leaking valve is towards the top of the photo. I have to turn off the manual valve just above the dripping valve to isolate it and stop the drip. I'm assuming that I have no choice but to...

Just a note to say that I have replaced the drive for the motorised valve and all is toasty once more. Thanks to all who commented. For those of a morbid nature, here's what the water did to the switch.

For what it's worth, here is the other side of the system (as good as it gets without moving the fridge). The pump is a Grundfos UP515-60 Underneath that is a Honeywell 272848 The other motorised valve is a Honeywell V4047H I believe the two motorised valves are actually the same - but...

Yep, I suppose the sarcasm is warranted. In fairness, I had tried the valve in manual and it didn't seem to make any difference. What I didn't realise, and I do now thanks to others' comments, is that the valve contains a switch that links it to the boiler and pump. But then, I'm no heating...

Thanks, all. I've a much better idea of what to do now.

Thanks to both of you. A wiring problem would make sense. Once in the middle of the night during the summer there was a leak from the piping above one of the motorised valves (the one with the plastic cover over it in the picture - the water dripped from the black valve (?) above it). The...

After an uneventful summer the heating has finally been turned on only to find that the boiler only fires for as long as it takes for the Megaflo to come up to temperature. During this time all the radiators in the house get toasty but then the boiler switches off and everything cools back down...