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Thanks Chrishutt I will get one in, just in case

When I moved the lever it seemed very loose so I took the valve off the pipe and noticed that the motor was reluctant to turn. I put my screwdriver in the slot where the flat tap would normally fit and applied just a little pressure - the thing then started to move of its own accord and...

just checked the valves they say 'auto and man' not off and on. The whole system is off now and one of the levers (heating) is in the man position - the hot water is on the auto position

Forgot to say - the room thermostat is set to 0 but the heating still belts it out +++++++++++++++++++++++++++++++++++++++++++++++ ok..ok.. what is OLLSKI?/ - could this be the dreaded PCB I have been reading about?

Ok - I have just seen a plan of an S system on the Honeywell Site (did a search for it) so I understand now. Could it be one or both of these valves have broken? - or am I jumping to the wrong conclusion? - Its just in the last house we had a similar problem and it was the valve

In the immersion cupboard - there are two danfoss valves - so in my complete ignorance I assumed that one controlled the heating the other the hotwater, but in thinking about it that cannot be the case can it? In my last house there was only one Why would the system need two valves?

Thanks for the prompt reply It seems that we get both hot water and heating at the same time.

Hi I have an Classic boiler + Siebe Lifestyle Controller. Heating / Hotwater controlled by two motorised valve - Danfoss with what feels like a springloaded lever and "off and on" at bottom of valve Few weeks ago the boiler stopped obeying the programmer - would not go off even...