I originally didn’t want to mess with the original wiring back to the boiler in case I wanted to return it to how it was.
What I have to work with at the moment is a cable that originally came from the pump attached to the ufh.
The cable was 4 core. One 230v live and a neutral which powered the heat link.
One switched live which I believe came from the pump, and the cfh wire returning to the boiler.
I say switched live but I think the switching was actually taking place after it left the pump via the heat link before returning to the boiler.
As you can guess, that was the circuit I was originally extending. As expected, the ufh hearing also fires up every time the radiators activated, but that’s no big deal, actually helpful in most cases.
Probably I should at some point go back to the boiler wiring point and start fresh.
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