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Just put of interest what do I do with the grey end in the boiler?

Already know where the switch is :-D

Ok. Will give it a whirl. Thanks

So nothing goes into x10, that stays as it is. And the only thing that goes to x4 is the black from 3 in the back plate? Thanks

Here is x4 on the board

That's what I am try to figure out

Hi guys, New here so please be gentle :) I have already searched but can't find my answer. I have a Worcester 240 and a hive system that I removed from an old house. I have attached images of what I am working with. Thanks