nest 3rd gen

  1. W

    Nest thermostat installation

    Hi all, Apologies another nest thermostat query re installation. Reading the other pages has been helpful and think I'm nearly there. Current set up: from mains fuse box 3 core cable to isolation switch - then a Live and Neutral come off and go to control panel (currently centaurplus c27), a...
  2. R

    Nest Installation - Understanding my wiring

    Hi All, Recently moved into a new house and hot water is not triggering the boiler to fire up. Not sure what's causing this but since I wanted to install Nest anyways I thought I'd get this done and see if the problem remains. My System has a hot water tank with 2 motorised valves and as per my...
  3. F

    Nest 3rd Gen / Heat Link not Turning on Hot Water unless heating is on

    Hi We recently bought a new home that already had a Nest heat link and thermostat, which we have taken on. Everything was working well and the system had learnt our schedule, giving us heating and hot water at certain times of the day. Due to a kitchen refurbishment, we needed to move the heat...
  4. M

    Another Nest Themorstat (3rd gen) question

    Hi all, I want to replace my current thermostat (pictures below) with the Nest Thermostat, but wire labels don't match. My boiler is Worcester Greenstar 24i Junior combi boiler, which is on the back of the wall where the thermostat is. Any help is massively appreciated on how to set it...
  5. D

    Heat link wiring to Honeywell Smartfit

    Hi, I’ve read multiple posts about installing the Nest Heat Link to the Honeywell Smartfit. However I seem to be struggling on how to physically wire it up. The attached photo is how the smartfit is wired up currently with everything working. Can anyone offer some advice and guidance on how...
  6. N

    Running Nest Wires

    Hi Folks, I can’t see that anyone has answered this anywhere else… Plumbers are coming next week to fit new boiler and nest thermostats, Replacing a pair of oldish wireless ones. I have asked for the the thermostats to be wired in rather than wireless, which they are happy to do as long as...
  7. G

    Nest Gen 3 to replace an old Horstmann Potterton controller to a Ideal Mexico 2 Boiler

    Hi, We have just moved in to an old property with a Ideal Mexico 2 boiler controlled from a Horstmann Potterton controller. The timer function has just stopped working and I thought I could upgrade the potterton controller to a Nest thermostat with heat link. I think the Ideal Mexico 2 is a...
  8. R

    Nest 3rd Gen - No Hot Water Control

    Hello I managed to replace our old Honeywell ST9420C and wireless thermostat with the Nest Learning Thermostat V3 using the following wiring layout: Honeywell-Nest N-N L-L, 2 & 5 4-3 3-6 Previously, on the old Honeywell programmer there were just 4 wires - N, L, 3, 4. This is working fine...
  9. R

    Replacing Honeywell ST9420C and Wireless Thermostat with Google Nest

    UPDATE: Now resolved this myself, thanks to earlier post by Muggles. I just forgot to put the additional live connections to T2 and T5. Silly mistake on my part but all working fine now. Hello I’ve just bought a Google Nest Learning Thermostat v3 to replace our old setup. Sorry, I know there...
  10. K

    TP5000 to nest 3generation

    hello Team I know there is an old topic about the same thing but I'm not sure I understand can you tell me if when I change I have to connect the tp5000 the brown and black cables or it is in yellow regards
  11. A

    Installing nest 3 on combi boiler with unvented indirect cylinder.

    I got the nest to work great with the heating of the house (gas boiler), but the hot water for the house stopped. So no idea what happened. This made me think I should connect 4 to 10 on the main wire box as that is how the nest can talk to the water tank. Is this wrong? 20211106_162911 by...
  12. D

    Nest Wiring issues 3rd Generation

    I have a Nest 3rd Generation heatlink and thermostat which is connected to a y plan system that includes a Baxi solo boiler, grundfos pump and a Drayton mid point actuator all wired as labelled through a Drayton LWC1. My issue is that regardless of what I do the heating is on. The thermostat is...
  13. Murrell

    Nest - No power to existing thermostat

    Hi Everyone, I have replaced my existing Myson MEP2C with a Nest 3rd Gen. Everything went well, except there seems to be no power to the existing stat where I was planning on hard wiring the new Nest thermostat. Here is the wiring setup before at the conrol where: 3 = HW on 4 = CH on Here...
  14. E

    Is it possible to replace Altech model ALTHC007 with The Nest Learning Thermostat (3rd gen)?

    Hi All, I am looking to replace my old thermostat Altech (model: ALTHC007) with The Nest 3rd gen. Is this possible? It is connected to a Worcester boiler. All details on the pictures, let me know if you need anything else. I have no electrical knowledge beside common sense :) Kind Regards, E
  15. A

    NEST Thermostats Installation

    Image by A-J-P posted 6 Apr 2021 at 2:39 PMEF8D30D6-A19C-4199-AE01-91F196EF1A9D by A-J-P posted 6 Apr 2021 at 2:39 PMB3851C9F-408D-45A1-AC33-10150AE47EBE by A-J-P posted 6 Apr 2021 at 2:39 PM1DF1C3F7-7CDF-44BA-817D-CC6F02558549 by A-J-P posted 6 Apr 2021 at 2:39 PMImage by A-J-P posted 6 Apr...
  16. B

    Are my 2-Port Valve wired incorrectly? Kettling problem.

    Greetings all. I'm after a bit of advice as we have an issue with our HW kettling and on closer inspection the wiring on our 2-port Valves looks a little suspect to my untrained eye. Background: The house was built in 2001 and has an 'S' CH/HW System installed. If the HW is on and the CH is...
  17. Niall70

    24v myson ufh with nest thermostat

    Hi guys have 24v myson ufh manifold system set up with 2 zone with actuators. I want to control the zones with nest thermostats I have a cat 5 at the thermostat so that sides all good but I want to know what I need to run from the nest junction box to the manifold. Can anyone help? Cheers
  18. Ash D

    Replace Honeywell ST6400C With Nest

    Hello all, Now that I’ve had an unvented cylinder fitted, I’m considering having a Google Nest (3rd Generation) thermostat fitted. I’ve read a few threads on here by others who also wanted to replace a Honeywell ST6400C controller (with room thermostat, hot water cylinder thermostat and a heat...
  19. A

    Combi Boiler to Nest , Please help!

    Hi all, Hope you are all well. Am trying to install a nest 3 gen in my flat with a combi boiler. I have a Honeywell timer ST6100A with a frost room thermostat and a combiner's boiler 24i green star junior. The timer controls hot water and the room thermostat controls central heating. I need help...
  20. B

    Advice/confirmation for Nest install for Greenstar 30DCi classic boiler with Integral Diverter Value

    Hi all, I have read several posts and searched the internet and believe I have now got the correct procedure to install a Nest for my Greenstar 30DCi classic boiler with an Integral Diverter Value with a DT20 timer. If I could just get a second opinion, before I proceed it would be really...