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Thanks again. The microswitch in the valve was jammed. With a few clicks it fixed its self. Probably on it's way out, but I'll know what the problem is if it occurs again. Thanks for all your help in sorting this one out. Ian

Thanks guys, strongly looks like the head of my honeywell valve has gone. Off to get a new one. Thanks, Ian

zone valves are a honeywell for the DHW and a Danfoss for the HTG. if I manually switch these to open I can hear the waterflow change (and in the case of the HTG the radiators get hot). So I think the valves are OK. Can you manually switch the valves to off or just on? Thanks, Ian

Thanks Tibbot, I think you've set me on the right track. I believe I have a wiring fault. (goodness knows why the previous owners never picked up on it!) From my reading of the 50FF Installation guide the boiler is a simple on/off affair with its mains power being switched on/off my by...

Moved into a new house with a Micron 50FF boiler. Have noticed that every so often the boiler switches on for a few seconds. It does this when the programmer is showing off for both hotwater and heating demand. The boiler appears to work fine in all other regards. I'm not sure exactly...

Is it possible to still get cooker sockets with a hole for the cable, or do they all need a separate cooker connection box? My wifes flat has a broken socket of the above type but we can't find one to replace it with. Am I going to have to dig in a new cable (and all the 'P' problems this...