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Thanks for all your help. I really appreciate it. I'll alter the diagram with the Nest added, just to confirm that everything looks ok, before I tackle it again...

So am I right in saying that it should be; * Disconnect cables from CH ON and R/S ON to the old thermostat * Reconnect these cables to the Heat Link T1 and T2 * Remove current thermostat and replace with the Nest thermostat - will now powered from the Heat Link * Disconnect R/S ON to CH...

I had everything switched off whilst wiring the Nest in, but it didn't go bang when I switched it back on...I assumed (a dangerous thing) that the existing thermostat was at a lower voltage. I'll check tonight to see what voltage it's at, as I'm surprised I didn't melt the Nest thermostat...

No, the old thermostat was removed, and replaced directly with the Nest thermostat - brown from old therm to T1 on Nest, black from old therm to T2 on Nest.

I was going to wire the Nest thermostat in place of the current room thermostat - this is where I had it originally wired and working, until I reversed the installation due to the pump issue.

Sorry, I'm a bit confused now. So where does the call-for-heat wire from the Heat Link connect to? If I disconnect the thermostat wire from R/S ON, then it would no longer provide power to the room thermostat for when I replace it with the Nest thermostat.

Thanks Jack. The diagram is how the system stands now, without Nest wired in. So; * R/S ON to Heat Link satisfied * Heat Link call-for-heat to where R/S ON currently connects to the CH valve?

Would you mind suggesting how I would do this please? I'm not sure if the Nest Heat Link 'satisfied' and 'common' would be needed to do this.

The boiler was sitting at 0 status (no call for heat), which is correct. I believe it was only the pump that was still running when CH was set to 'always on' on the programmer - it was the only part that was 'humming / vibrating', but it may have been the CH valve as well.

Forgot to mention that the boiler (kitchen) doesn't sit near the pump (upstairs airing cupboard), so wiring the pump into the boiler isn't an option at the moment.

Hi all, I'm sure this forum has been inundated with posts about Nest installs, so I apologise if this query has been answered before, but I couldn't see anything as I browsing... We've recently moved into a house which is relatively new (4 years old), and I'm trying to install a Nest into...

Dave, thanks again for the manual. The boiler seemed to sort itself out, so we cancelled the call out to the boiler repair guy. However, it's stopped again...just at the time when the British weather takes a turn for the worse. Great. Does anyone have any ideas what it could be? Happy...

Cheers mate!

Hi all, Hope someone might be able to help, as I know nothing when it comes to boilers, but I'll post what I have tried (either rightly or wrongly). We have a Chaffoteaux & Maury Britony Combi 80 (47-980-12) boiler, which is having problems. It's occasionally firing up, but it doesn't...

Thanks for your help! Do you know what the removable pins do by any chance?

Hi all, Just registered today, in the hope that someone might be able to help... I moved into my house approx. 2 years ago, and we have Westherm radiator valves on all radiators. It's just come to light that they should be TRVs, but I can't work out how to set them correctly etc...