The grey wire is not neutral and after switching the boiler on and off, all cables went dead.
Probably going to return the hive, get a nest and get a heating engineer to come and install the correct cables for open therm.
Hi, I've just purchased a Hive Thermostat today. I originally had a Honeywell Home T3. The boiler is a Baxi Assure Combi 25.
The issue I'm facing is the wiring (seems as though this is a common theme. Anyways I've attached a picture of the wires that were in the wall.
There is a brown one, a...