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Hi, Thanks for the response. Haven't traced the full wiring but yes 99% sure that the boiler is fully off. The switched live terminals (1&2) are still connected together with the L/N feed being the only connections. Another data point is that the light D doesn't remain continuously on, but...

Hi, I was looking to install a Nest thermostat and started trying to understand the existing wiring to work out how to add. The boiler is an Alpha CD20S and is currently set up (in my limited understanding) in a S plan configuration (2 valves rather than 1) as part of a pressurised hot water...