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This was my old wiring from thermostat n reciever

I have only one black wire tho? At the moment hot water working fine it's just the central heating. Sorry to be a pain.

Hi CBW, Thank you very much for your reply. I wired black wire to no 3 on hive, but still central heating not comes on. Any ideas? I attached you a picture below. Many thanks.

Hi Guys, Can someone help please. I am trying to wire my hive reciever to the potterton combi boiler. There are 4 wires coming out from my boiler ( L,N,E and a black wire). Manage to wire all of them apart from the black wire. Not sure whether it goes in number 3 or 4? Thank you. 20210602_170518...