Wiring Hive to Combi Boiler

[bigcheez2k5]

Hi, I've read numerous threads on here about this subject and used them to wire in a Hive mini but I'm having issues with it not activating the boiler.

Boiler is a Main Combi 30, pic of wiring diagram from boiler panel attached

The pics attached are how I have it wired, which I believe is correct. Left wire is the 5 core flex going to the Hive receiver

I have tried setting the timer on the boiler to constant/on, pic attached of the one installed. Lever pushed to the top and all the timing marks are inwards. I believe my issue is something related to that but even with all the connections to the timer removed(pic attached), Hive still won't control the boiler.

Have I wired it in wrong or is there something else I am misunderstanding?

 

[CountryFan]

You appear to have 2 cables going to the live and switched live to the boiler. One is obviously the Hive, what’s the other for? Also, is the black cable power feed for the boiler?

 

[RandomGrinch]

In addition to above...

even with all the connections to the timer removed(pic attached), Hive still won't control the boiler.

In the picture with the wires behind the timer, try connecting together the two black wires in a separate terminal block.

 

[bigcheez2k5]

You appear to have 2 cables going to the live and switched live to the boiler. One is obviously the Hive, what’s the other for? Also, is the black cable power feed for the boiler?

Those go to a 'water conditioner'. It was on the boiler when we bought the house and wired into where the previous thermostat was connected. I just left them in when adding the Hive

The black cable is the power feed for the boiler, that goes to a 13amp plug nearby.

 

[CountryFan]

Is the dial on the front definitely set to heating and hot water?

 

[bigcheez2k5]

Is the dial on the front definitely set to heating and hot water?

Yep. I still have heating, it's just currently only controlled via putting the timer to constant or setting the timer, instead of course via the Hive controls.

I've only just got home this evening so am yet to try the other suggestion of connecting the 2 black wires at the timer together to bypass it

 

[bigcheez2k5]

You appear to have 2 cables going to the live and switched live to the boiler. One is obviously the Hive, what’s the other for? Also, is the black cable power feed for the boiler?

I believe it may be sorted, thanks to this reply.

When asking about the other wire, for the water conditioner, it made me think to just remove it to simplify the wiring incase that was causing the issue, well it was. Haven't touched the timer wiring and it seems to be working.