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That was it! Many thanks for such a quick response, that was a huge help.

Hi, I'd like to replace my old Apt analogue timer with a new digital one but I'm having trouble working out the wiring. The system is currently wired as follows: 3A fuse -> Apt (live in = 2, live out = 1, both neutrals = 3) -> boiler The new controller is a Secure SRT322 (similar to a...