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It's to remove the TR2. And a pair of the wires need to be bridged. Believe me I have read all the articles and that one about the reverse engineering isn't clear. It talks about finding the resistance between two pairs of the 3 wires but without making it clear which is which.

Thanks for your replies. I am not connecting them together. I just need to identify which wire is which. I know the TR2 is a low voltage device. Here is a photo of the connections to the boiler.

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...