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I live in the UK and am trying to replace a Honeywell WiFi thermostat with a Google Nest thermostat E. I have 2 3-core wires coming into my thermostat, 2 live and 2 neutral wires, 1 pair I believe are for the incoming power and the other possibly request for heat, I'm not sure but it's a combi boiler. One pair of wires originally connected to the left block of the Honeywell thermostat; the other obviously connected to the other side.

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