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    TR2 thermostat wires - which is the neutral?

    I am just looking for some simple information which I can't find online anywhere. I have an old RD532i boiler and TR2 thermostat. The wires between them are labelled F, 3 and 4. Can anyone tell me which of those three wires are the neutral, the live and the switched live? (I think that's what...
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