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Hi Guys, job done as advised, all working, many thanks

Will do guys, thats the plan tomorrow, if I can pick up the part. Appreciate all the advice and pleased I came across the site

I'm assuming changing just the head first is a reasonable option, rather than the whole brass body, would that be okay ?

Have done that this evening, thanks, I think I may try purchasing another valve tomorrow and change the electric head first rather than the whole valve ( if it appears to be turning okay ), as that seems to be the general idea for the fault, I thought it may be a board fault on the boiler but i...

I found it in that position when both were calling, I changed the programmer to h/w and increased the cylinder stat to watch the lever move across, then set the programmer to heating only , the boiler went off and when i got back to the valve it had like you say moved the lever back to the "H"...

Yes it does

No on heating only nothing happens, but once the h/w is calling boiler operates. Have a basic Drayton hard wired room stat. I can hear the stat clicking on at the wall when the programmer is set to heating by the way.

Yes have a Drayton MA1 Mid Position actuator, have tried a few scenarios, and i can see the valve moving when the programmer is operated but this evening when it came on from cold for both h/w and heating - rads got nice and hot but once the h/w got to the cylinder setting the rads dropped back...

Hi Guys Sure this has been covered but I can't exactly find it. When my programmer is set to Central heating the boiler will not ignite until the hot water is also calling, then the rads will heat up, but start getting cold once the hot water is to temperature as the boiler then cuts out...