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You’re quite right. Everything is 230v. 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...

No. That would be ridiculous. And nothing would run because there would be no power.

How would that be the case using the relay in the heat link to break the live?

I've tried to mock it up on a board with just 1 as it's easier than working in the loft. Hopefully you can see the detail. Would this work? I think in short I have used the nest switched live to power the valve which then goes back to the shared neutral and the aux switch in the valve powers the...

Gotcha. The individual zone ufh pumps do allow flow even when they’re not running effectively allowing a bit of flow when the boiler pump is powering the radiators. The zone valves were more intended to stop the radiators heating unnecessarily when the ufh was working harder and longer. I’ll...

I did mean understand lol. Thanks - that’s very helpful. I simplified some of my language. The background is, it’s an old installation that didn’t work very well. The installer effectively put the ufh on the same thermostat as the radiators. This of course meant that the radiators fired...

I think that answers what I was after; thank you. The thermostats are simple nest heat links. They make or break the chf wire from the boiler. The aux switch allows for the circuit isolation if I underestimate correct. You get my concern that the other circuits would have been back fed by...

Yes; appreciated. Each zone has a relay activated by the stat. Each Drayton valve also has a relay micro switch available to use. I’m cautious though if they all go back to a single cfh, I don’t want each zone to power other pumps. Does someone have a diagram I could use to make this simpler.

I’m hoping someone might be able to help me out with a wiring diagram. The system runs off a combi boiler. There is a main house radiator circuit. There are two additional zones with underfloor heating, each with its own pump and isolator valve. Each of the three zones has its own...