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This is what has thrown me a little, the old one has the switch live on the ‘always closed’ position, where as the new one has it in ‘always open’. It’ll be trial & error ultimately, set the thermostat really high and see if the boiler kicks in & shuts off when the dial is turned back down.

Evening all, Absolute amateur when it comes to reading wiring diagrams so hoping someone with experience can help me double check the wiring on a Honeywell Room Thermostat replacement and call bull on anything I say that’s incorrect. Old analogue thermostat is a typical 3-wire setup with Live...