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It’s looking more complicated! Some additional info: The room thermostat is wired to the wiring centre via another terminal box, only 2 of the 4 cables are used, the earth is not connected at the thermostat end and there is a grey cable that is not connected at the terminal box. From the...

I need some advice on the fitting/wiring of a timer/thermostat to replace a room thermostat , first an explanation of my current system: I have underfloor heating with 8 zones downstairs, and a separate radiator circuit upstairs. The downstairs UF heating has a simple thermostat in each room...