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Can't i'm afraid, no longer at the house. Was just hoping someone had come across this before.

Nope. Conventional set up, only differneces are a recirculating HW pump and then the suspect port valves.

Thanks Fireman, yes he should but I think he's in the dark as much as I am and has no idea what's going on. I don't know if it's a DIYer but the people in the house previously lived with the heating on for 2 years and just opened the windows as a solution instead of getting it fixed.

The boiler is one of those little compact Pottertons, Envoy i think. Not sure on the cylinder.

My boiler is firing whether the programmer is on or off. There is no stat in the house as far as I can see. The programmer has been replaced, didn't make any difference, the heating is still constantly on. Having looked at the controls there is a 3 port valve, which then leads into a 2 port...