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Thanks, food for thought. Was actually curious to know what the black wire at CN5 was for. It's on my Voltage-free control diagram, same as the manual you linked. However my Functional wiring diagram is a bit more simplistic, doesn't show the black wire at all and has no mention of the safety...

Did you have any joy? I am looking to install a Hive also and have the 25Ci model, so similar layout of boards. Manual would suggest both light blue and black wire from CN5 to be removed and taped up, replaced with wires going to hive, but I have been unsure if I remove the link wire as part of...