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Sounds like a very similar situation to me I got mine sorted on here :)

Yeah my wording wasn't great eh? I'm not beyond getting new kit if I had a use for it.....I've fitted several things around the house that would've benefitted from a cable tracer, so I might grab myself one. Thanks again, if there's anyway I can buy you a beer or a coffee or whatever, please...

We have LIFT OFF!!!! Guys, I cannot thank you enough. I was going out of my mind and was clearly past the point of my ability and you've absolutely got me out of a jam. Thank you, thank you, thank you! Any advice on how best to terminate the programmer upstairs? Wago connectors and a...

Absolute legend. Will connect and report back momentarily!

Also zero cycling when trying to put the heating on (obviously no SL connected though) Connect the black wire to 3 now I assume?

We have lift off....

Yessir!

This is as of now and the video above. If I switch the grey and the black (as I would expect it to be) the Hubr is completely unresponsive

Example:

I have, got it all up and running but the heating wouldn't turn on. Then it did and wouldn't switch off..... Even got it added in Home Assistant

If I get some 4 core cable and just hook into these : What would be your recommendation on removing the old programmers? And would that work with the valves in place?

It cycles for a minute then is just permanently on. I think it's more likely to be my wiring tbh..... Would I be better off just feeding it straight from the boiler rather than trying to repurpose the old programmer wiring? Or just get a professional in and stop messing about....

Same result unfortunately

Ok, I'll try and remove the opentherm and see where that gets us :)

Yup, it works. But it does what I mentioned in my OP. Cycles for a while, then switches the heating on permanently and loses connection to the thermostat so I can't turn it off.

Sure thing!

Tbh that was just one of the attempts I took the picture on. Originally I'd installed it in 3 and had no luck so had attempted other configurations based on other forum posts. Any advice on what I'm doing wrong wiring wise? I haven't touched the opentherm wires and I'm using the wires from...

Oh weird. I'll attach them to this post.

Absolutely! - Done!

Same issue here, exact same system - did you ever get anywhere @mplacona?