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Re-posted it as per your previous remarks being in the wrong section. Feel free to delete it etc.

Found the bugger! Seems to have done the trick. Many thanks all.

Thanks. I've watched a useful video found online re this - talk about connecting 4 and 5.

The 1st pic is of the original controller wiring and back plate. The thermostat was a Honeywell (I think!) I've added a pic of the wiring behind the thermostat prior to installing Hive Thanks by the way!

Nope just removed the old thermostat, capped and tucked the wiring back in to the recess and fitted the Hive thermostat on to the original back plate. Just 1 x Hive installed.

Thanks- no just disconnected and replaced with the Hive stat. Is there a simple means of doing that or is it a call out job?

Hi, I've recently replaced our Honeywell controller and thermostat (approx 20yrs old) for Hive Active V3 (dual controller). The hot water works fine however although the boiler fan kicks in on activating the heating there is no ignition. All Hive status lights are as they should be. I've...

Many thanks for the replies. We've only just moved in to the house. If it helps, I've added a pic of the boiler/expansion tank and one of the hot water cylinder in the uostairs airing cupoboard. No other work has been done as far as I'm aware and yes, I've waited a few minutes for it to kick...

Hi, I've recently replaced our Honeywell controller and thermostat (approx 20yrs old) for Hive Active V3 (dual controller). The hot water works fine however although the boiler fan kicks in on activating the heating there is no ignition. All Hive status lights are as they should be. I've...