I have been given a HIVE pack as a gift and I've tried to replace the honeywell receiver unsuccessful. As you can see from the photo there is only 1 (3) core cable currently coming out of the boiler to the honeywell receiver. Live and neutral very straight forward but wired to the same live cable is another bridging wire going into A. B also seems very straight forward too but when I replaced the receiver and used the same configuration i.e N in N, L in L, A in 2 d B in 3 the boiler won't come on. I've tried a couple of different configuration but I'm worried I could damage the boiler so stopped trying. I put the Honeywell receiver back on and worked immediately. The Hive hub and thermostat are also functioning and worked when the receiver was wired, the boiler just wouldn't turn on. If anyone could help I would really appreciate Thanks