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I need to do exactly this and I’m not sure how there is a misunderstanding. I included a link to a thread where someone had done this install.

I presume I am to take A&B out of the wiring centre? - and wire to heat link as advised

Thank you Ian. This is very helpful. As above though I presume I remove the stat A&B from the wiring centre to wire into the heat link. Will the display be powered from this though? Thank you

I think that’s pretty much what I thought in my first post but it was said this was unnecessary. Thank you for your help

Thank you. I still have a spare core/cable (grey one unissued behind the stat and inside the wiring centre). Please let me know what I’d need to do as I need to power them from that cable. Thank you

Very helpful thank you. So I’m clear I take out the two stat wires on the wiring centre and wire to the 2&3 on the heat link? Wire the nest display in and job done. I was concerned my existing wiring a&b didn’t power the stat. I presume the nest will be powered from those? Many thanks

HL = heat link The thread I have been referring to is here - https://www.diynot.com/diy/threads/nest-thermostat-gen-3-dual-zone-install.601653/ is where the link was indicated as necessary. Your suggestion sounds far more straightforward. But, do the valves not need to be connected to the heat...

I have a Logic ESP1 35 Combi Boiler and 2 Honeywell T3 thermostats (T3H110A). I wish to install 3rd gen nest and have purchased two. I have read a lot on these forums of other installs. From what I can see I need: 1. To run a L&N from the wiring centre to the HL 2. Put a jumper cable from L to 2...

Thanks for the helpful replies. I decided to stick with the existing remote system. As I’ve converted to LED there will be no issue with the load on the remote. I therefore re-wired with a 4 core cable such that the on/off for the lighting at the remote sends current or otherwise to the light in...

I have a remote control ceiling fan with inbuilt light. There was a basic ceiling rose with a single connection to the light switch. The fan replaced that. The light wasn’t bright enough so I installed some down lights as well, running from the same feed and switch. I realise now that I can’t...

I am not actually sure I think I may have got confused with the in and out marking on the new switch. In any event basically swapping over what I had already, as was pictured above, worked fine

Thank you very much that worked perfectly this time. Very grateful

I have a Deta intermediate switch with L1 and L2 at top and bottom Brown in L1 and Black in L2 from one cable Black in L1 and Brown in L2 from a different cable The grey are connected together in the back box I have purchased a new Crabtree switch which is intermediate but with L1,L2,L3 and L4 I...

Hi I have inadvertently purchased two different types of Nest - one ‘standard’ and one professional. I have a split system so will need to fit two. I cannot work out what the differences between there are but primarily whether there would be any issue in installing two the two different types...

Thank you very much. I may be being stupid but I can’t see a -12v aux on the board I’ve just got the Aux + which was part of my confusion. Many thanks indeed

The twin alert has: T, T, BA, Spk, -12v, +12v The board has No, Aux +, Spk, Stb, Bell, TR, B-, B+

Please may someone very kindly assist me with the wiring of the twin alert directly into the alarm board. The instructions for both are less than clear and the twin alert guide doesn’t correspond with the connections in the main board. Many thanks indeed

Thank you very much that’s really helpful. I will delve into it to try to find out the difference between the two versions Many thanks again

I have kindly asked the person who provided such helpful information about his identical install which version of the Nest they used. Nothing more.

Please may I very kindly ask a question. I have the same boiler and have saved this thread to install my system. But, I somehow have bought one 3rd gen nest learning thermostat and one 3rd gen pro. I’m still not sure I fully understand the difference but I wondered please which one you used for...