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Thanks xr4x4 but I've already taken care of thermostate/control unit on the wall, powering it via USB, so no issues there.

It might have saved their frustration if they'd actually said that! I do appreciate the efforts though and realise it must be frustrating talk to a novice. When I help people who work in a profession different to my own I know it takes a lot of effort not to think "why not just get a...

Yes, I realised that already. I mean at the other end (i.e. where it goes after that box on the wall). Now I realise that I am meant to follow a different diagram I can see that it would work to put the Heat Link box upstairs near the valve itself, so I don't need to worry about where it goes...

That's a pity because your comment was helpful and I've had another look at the installation guide. I'm not there yet, but moving closer thanks to the help I'm getting. Clearly talking about wires to the thermostat don't really help given that I don't have any! I found the diagram for...

I followed the one at the end of the booklet. I may well have misunderstood it though! As I've said a couple of times already, my old thermostat is WIRELESS. It has no wires going to it whatsoever.

Thanks, that's very helpful. The current system is pretty messily wired, so I am not sure that the colours will be the same, but I expect I could trace them through. What I am stuck with though is where that white wire from the valve would arrive downstairs in the house so that I can attach to...

No because that's the controller for the hot water. And indeed, presumably the controller for the 3 port valve - or is that usually controlled by the PCB within the boiler itself? For what it's worth and for completeness, if I switch the controller off completely I unsurprisingly still have...

Huh?

No. As per my original post, the Nest calls for Heat and that fires the boiler, but it doesn't actuate the 3 way valve which directs the hot water to the radiators.

Well, it (the old, original thermostate) is wireless. So there isn't anything to disconnect as such. I can (and have) dial it down to zero or take its batteries out. This stops the current controller trying to control the heat and leaves the job to the Nest. But that's the problem; the Nest...

The installation instructions don't talk about wiring it in series with anything. They state you simply connect live and neutral, bridge the common connection to live, then connect the call-for-heat.

I'm not aware that Nest is specifically Y or S plan. After all, it's a call for heat mechanism. Other people seem to have it working with either.

I am trying to install a Nest thermostat. It's replacing a wireless Honeywell thermostat and connecting to a Potterton boiler downstairs. Upstairs in the airing cupboard is a hot water tank, a pump and a 3 way valve next to the tank. At the moment the call for heat on the Nest Heat Link...