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Interestingly replacing the honeywell ST699 with the exact same wiring on the Hive has also fixed the issue with the boiler not turning off.

all done and heating is working with the Hive controller , thanks again!

Thanks so much for all your help , I'll rewire to match the original installation and let you know how it goes :)

I opened up the Honeywell wiring hub near the boiler power switch to try to get a better idea of what the wires were doing The two white cables coming from above come from the thermostat receiver. The original ST699 is located on the floor below this box Just investigated more closely and the...

No the heating and hot water could be controlled separately as far as I was aware. (although I most often had them timed to come on at the same time)

Thanks for the reply! Yes as a default I will just replace the wires to the exact layout of the Honeywell , utilizing the L N 3 and 4 terminals on the Hive. It just seems odd there are 2 wires into the Neutral on the Honeywell and I wonder if the boiler not turning off sometimes is caused by a...

20220126_215955 by Bedster posted 27 Jan 2022 at 10:41 AM This is the existing wiring of the st699 I want to upgrade to a hive. I follow everything except the second blue wire that is going into the neutral port. The darker blue wire looks like an actual neutral wire , could the light blue...

20220126_215955 by Bedster posted 27 Jan 2022 at 10:41 AM This is the existing wiring of the st699 I want to upgrade to a hive. I follow everything except the second blue wire that is going into the neutral port. The darker blue wire looks like an actual neutral wire , could the light blue...

Wiring ST699

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