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Hi Stem. The manual has numbering backwards to what i wrote but is the same setup. So if we work off the diagram, 1 & 2 are for frost stat so not used. 3 runs 230v when boiler is on. 2 runs 0v but is jumpered between 2 and 3 normally (as there is currently no room stat). Also looking at...

I’m looking to self install a Nest Learning Thermostat on my Worcester Bosch 280 boiler. The wiring looks straight forward, but I just wanted to sense check before I go ahead. The boiler doesn’t have a stat currently, so on the stat section has an unused N connection. 1 & 2 are jumpered (2 shows...