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Wired it up and all working a treat - thanks all for the help

Hi @ericmark @stem @CBW You were right the programmer was the issue. Fitted the replacement unit this morning and everything is working again. Just wanted to run this past you before I fitted the new thermostat. The backplate on the programmer has the Live and 1 (which I think goes off to the...

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The backplate on the Honeywell is slightly different. Ah I see, the programmer must be broken then. I'll get a new one and then have another go. Thanks @stem Then try, Brown (live) to A Grey (switched) to B and terminate the rest.

Thanks @CBW. Here's a few more pictures. Old one : has a programmer downstairs: Strange thing is, now I've connected the old one back up as it was before, the programmer no longer has any effect on the boiler. If the thermostat is on, the heating comes, regardless of if the...

I'm replacing my thermostat with a digital one as the old one always overheats the house. The old one has three wires: The new Honeywell has a few options for wiring in the manual: I connected live (brown) to A and 3 (grey) to B, leaving the other two wires unconnected. When doing this...