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Thanks I'll try this after work today.

Yeah I can, the heating definitely works, i can heat up the radiators no problem. Not sure the thermostat does anything I usually just smash its buttons it i feel the radiators up.. never worked out how it works reliably, so i could believe it if it was reversed.

Thanks for the reply. I don't have an explanation for the wires - they predate me (purchased property). If they were crossed it certainly explains why i think the current setup doesn't work. How do you recommend I test for this? It is a combi boiler. I have the third gen nest. (not the e)...

See attached images: I have a danfoss thermostat. It is currently installed in the hallway - I removed it and you can see the wiring behind it. It's a TP4000/TP5000 series. The boiler is downstairs and has a switch besides it that you can see. Question: How should I install the Nest heatlink...