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Hello 45; have now changed the zone valve, happy days, central heating works! There was a clue in the various bits of plastic that fell out of the old one when I lifted the lid!

Hello 45 - yes, two by the looks of it. Would I be right in thinking the one bottom right controls ch and the one top left is hw - or am I making that up?

Cor, didn't mean to start a fight! :lol: zone valve stuck on... what's a zone valve (assuming that's not what I'd call a room stat! - and where would I find it?

OK... That probably takes it beyond any hope I have of sussing it out! External controls beyong the stat & programmer? And which valves... As you'll have guessed, I'm not a plumber!

Should have said - yes, conventional.

We have a Worcester Bosch 30CDi, installed 3 years ago and has been working fine. However, woke up the other day to find that even though the stat was set to nil, the boiler was running at max. A bit of investigation; hot water works as normal via the programmer, but ch can't be controlled at...