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In case anyone needs to know in future, I had to connect the blue neutral from 4 to N, the brown live from 1 to L, the black from 2 to 2. It's all working now.

Hi, I am replacing an old Danfoss RMT230 thermostat as it has come to the end of its life and just need to confirm the wiring for the new RET2000MS. The existing 230 looks like this: and the wiring diagram is here (fig. 6). The wiring diagram for the RET2000MS is here (RHS of p. 7). So I...