You may want to just turn it off before undoing anything. Undo the 2 screws underneath the Hive receiver and lift towards you from the bottom, imagine a swing like motion. Take photo of wiring, and then put the receiver back on, engaging the tabs at the top 1st and push it downwards and tighten the 2 screws back up.
Naturellement I don't have the right size of screwdriver so this'll have to wait! I'm convinced it's essentially wired backwards and should work if the wires are swapped...
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