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Thank you gas112. I've also found this https://www.ebay.co.uk/itm/235083941331 but my difficulty in both cases is being sure that it is the correct (or compatible) part.

I have an old gas boiler - a Potterton Kingfisher II RS.80. The piezo ignition unit has failed but everything else is fine. A gas engineer has told me that the part is no longer available. That seems to be true but I can't help thinking that I might be able to find one on eBay or elsewhere...

Just to close this off. I replaced the controller and all was well. It seems that the wireless thermostat receiver had blown and perhaps damaged the controller in the process. COM and NO were the correct terminals for the thermostat. All working well now with new controller and (wired)...

Thank you ianmcd. Maybe the controller is the problem then. Think I definitely need a professional. BTW, the photograph is how it was before I did anything and it has been working ok for years.

Thank you Madrab. Yes, I think I'm at the end of my DIY ability. Thanks for the help.

Thanks. It's a Potterton Kingfisher 2. It was all working well until the thermostat seemed to fail. I guess there is either a bad connection or the thermostat failure has caused a problem.

Take two. Old wiring... Old wiring diagram... New wiring diagram...

Hmm, not sure my images are working?

Thank you JohnD. Old thermostat as it was... ...and wiring diagram... I thought that simply connecting COM and NO would bypass the stat. Doesn't seem to, unless I have a different problem elsewhere. New stat wiring diagram... ...I connected COM to COM and NO to NO. Turning it right up...

I want to bypass a room thermostat so that it is effectively permanently "on". I think I just need to jump two wires, but which two? Or am I wrong anyway? I have four wires labelled NO (normally open), COM (common), L (live) and N (neutral). Jumping NO and COM seems to do nothing (that was my...