Neil Stevens
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- Nov 12, 2024
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I am wiring a thermostat into my combi boiler. The live brown and blue neutral I am fine with. I can see from the wiring diagram that the two terminals A and B on the receiver box are used. There are two wires from the boiler coloured black and grey. Which goes to which? I understand from what I have read that T1 (call for heat) is the black wire and T2 (return) is the grey but I wanted to be absolutely sure.
Thanks
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