Thanks for the response.
Yes it's a single channel reciever. And the old stat was battery powered so didn't require the neutral.
It's a new build, and before buying there is an option to upgrade to smart heating. I'm assuming the grey wire is the neutral for the option of a non battery powered...
Thanks in advance for any help
I'm installing hive as per instructions on an older thread.
The stat had two wires connected, and a third I'm assuming is neutral that wasn't connected.
Connected the hive backplate including the li k between live and the first pin, but reciever doesnt come on when...