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Thanks for thinking of this. I have nothing whatsoever to report yet. This house refurbishment project took an unexpected turn several weeks ago. I have spent the last few weeks rewiring the lighting and replastering. Believe me when I say that I cannot wait to return to the Nest! You will...

Yes, the rest of the walls appear to have been emulsioned with a roller previously

Should I paint over these areas of fresh plaster before spraying? I have just patched and replastered these damaged sections of walls: I will be using a Wagner 250M airless paint sprayer with budget white emulsion. Would the fresh plaster benefit from some direct paint first?

@stem - Thanks for the detailed advice. I will investigate first thing tomorrow morning and report back.

@stem - Everything appears to be wired correctly. The Nests work and make the boiler to fire up just fine. But the boiler will not switch-off when the Nests tell it to. What could be the most likely cause?

Wow, thank you so much! I can't wait to work through this to double check that everything is correct before I fire it up. I am sure that this will be useful for many more people too :)

Please be assured that I am not winding you up. I just do not want to make a mistake. I will run two links from the permanent live to terminals 4 and 5 on the junction box.

I am sorry, I should have specified that I was referring to the wiring centre junction box rather than the Heatlink. Please allow me to clarify. In the wiring centre junction box, should a link from the brown permanent live at terminal 3 to the two grey wires at terminals 4 and 5?

Thank you. I have linked Heatlink (L) and (2). I will sheath both HCLas. Should I send two permanent links from terminal 3 to terminals 4 and 5?

So I got my multimeter and tested every single cable for continuity. Turned out it had been wired incorrectly previously. So I reconnected everything from scratch and neatened up all of the cables. Here is my current progress: However, I note that you said: @stem - Is this now correct or...

@stem - I have one boiler. The boiler has 3-core cable running from it to the junction box. The strands are brown, black and grey. 1. Should the grey cable from the boiler be the the one that we are referring to here as the Boiler Switched Live? 2. Should this grey boiler cable be connected to...

Got it Understood. Thank you :)

I made partial progress today including: fitting a new wiring centre box to replace the tatty old one (only 10 terminals as opposed to 12, but still hopefully enough); rationalising then wiring into a more logical order (hopefully); connecting most of the cables, apart from the Nest power (to...

Thank you again for your confirmation and great insight. I will also split out the T1+T2 for both Heatlinks, and leave adjacent terminals vacant between the 230v and 12v connections. I will report back tomorrow with an update on the status!

Thank you for the clarification. Here is a updated wiring centre diagram: Heatlink and thermostat base are now connected to each other at wiring centre blocks 8 and 9. Both of the Nest Heatlinks' live and neutral cables are connected to wiring centre blocks 3 and 4 respectively, joining to...

PS: I can confirm that the original thermostats were not batter powered and there was no separate time switch or programmer elsewhere. Thanks

@stem - Thank you for your reply and apologies for my omission. The previous living room thermostat was as follows, with the hallway thermostat being a simplified equivalent: Does this accord with your excellent diagram?

@ericmark - Thanks for your advice. I have updated the thread. Looking forward to your next reply. Thanks

@ericmark - Thank you for your detailed reply. Here is a diagram of my understanding of your advice so far: What should I do to complete the connections when you say: - "a link in heat link L to 2"; - "and the 1's go to 3's"; and - "to use two thermostat the 1's need separating and one of the...

For reference, here is the Nest heat link wiring reference table: