Thanks for the reply, Yeah Hive receiver and hub powered up fine. definitely single channel, heat only as the water comes on as needed. It’s wired from the mains power beside it and was running a Honeywell st9120c only difference is that was wired to 1 and 4 not 1 and 3.
Sorry as I’m sure you have seen 100 of these. But from looking at the past posts it’s wired up right so I’m at a loss here. It’s all running fine apart from the fact it won’t fire up. It’s also a single channel any help would be greatly appreciated