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Will do, any thoughts on best way? Maybe wire it up as you originally suggested @CBW, leave the fascia off the Hive recievwr and then power on everything? Then check in what order?

Should be able to check that at the boiler end. The boiler schematic shows as follows, whether it's wired like that I'll check shortly.

I'll investigate whether it's possible to change the wiring boiler side to make switched live perm live? Would that maybe solve it

On the Hive reciever do I need to be pressing the button to switch the receiver on or anything? @ianmcd

Any further ideas? Is there anything I can do boiler end?

Wondering if this is the same issue? https://www.diynot.com/diy/threads/honeywell-t40-to-hive.601045/ However even with the timer on "call for heat", unless there is a stat demand it wouldn't kick in? My boiler is currently on the sun symbol which means when I click the stat over the current...

https://www.diynot.com/diy/threads/honeywell-t40-to-hive.601045/

Confusing. I'll check if I can see whats plugged in where on the pcb on the boiler, but the main lead from a fused switch on wall is the only cable into the boiler, whether I can see where it goes after I'll check. Bugging me!

No idea, is there a way to test it? I've rewired it back to old thermostat now as the Mrs says it's freezing in the house lol. Balls, was hoping this would be an easy one.

Tried that kicks heating on but no light on reciever still

So any ideas on where to put brown if I wire as Black N, Grey L

Multimeter in my father in laws van so don't have it to hand right now. I'll dig out a terminal block and try what you said. One point I did see is that the grey wire has a brown floating bit of sheath, bit like the earth sheathing but solid brown. Whether that's anything relevant don't know

https://community.screwfix.com/threads/grey-black-and-brown-wiring-thermostat.220818/ Saw this and made me wonder whether black and grey wrong way round

Yup, it's on, and in the mode that would normally await signal from the stat to turn heat on I.e. no programmer interfering and not in "moon" setting as Valliant have it I did switch the grey wire back to Term 2 and tried it like that and the boiler kicked in and permanently on

Should the grey be to N and the black to term 3?! May have been dust disguising the colours original images?

Current wiring @CBW

All wired in as I posted but no light on the receiver is that normal?!

May have figured it out...let me know if its correct if you can. Honeywell to Hive 1 > Live 2 > Neutral 3 > 3 Earth to Earth Link Live (Hive) > 1 (Hive - Common) Sound about right @CBW?

That's the wiring on the single channel receiver diagram

Hey @CBW might be thick here but what do you mean by L to Com? Obviously a link wire out from L on the Hive but to where?