Solution to an easy Away mode using an existing Nest


I currently use a Nest on our combi boiler and it works just great but have started to use Tado Smart TRVs to control the temp in each room/zone. Obviously at the moment there is no call for heat by individual TRVs as I don't have a Tado Smart Thermostat installed yet. Having read thru numerous threads it appears that changing to an Away mode with Tado (and I don't want to use Geofencing BTW) is very difficult and not at all flexible, so I have come up with a work around that I think will work and will also save me throwing my Nest away when I install the Tado Smart Thermostat.

What I plan to do it put the Tado Smart thermostat on the Nest's call for heat return to the boiler (see red dot on image). I would then leave the Nest on an unreasonably high temperature permanently, which should then mean the Tado can control the call for heat if required.

When I'm away I can simply turn down the Nest to our usual Away temperature which effectively isolates any instruction by the TRVs as the Tado would not be able to send a call for heat to the boiler because terminal 3 would be left open.

Anyone see any holes in this ?



  • samd
    samd ✭✭✭

    @sP1bOB No holes visible!! I have kept my Nest and could do the same but I would need to do a fair bit of re-wiring - tado stat is in same place as Nest was and is the measuring device for one of my rooms. Still might go that way. Good stuff!

  • I know what you mean @samd I had thought about putting the Thermostat on the T1/T2 feed to the Nest thermostat control cable but realised that as well as comms it also uses that to power the wall thermostat as well. I am lucky as I have ready access to the cables so it seems like a reasonable solution to me. Thanks for the feedback.

  • FYI, I just moved from Nest to Tado and managed to sell my Nest for £130 on eBay very easily. So if it doesn't work, dont just 'throw it away' :)

  • Thanks @Adzyp , I was a little imprecise with my language and perhaps should have said "dispose" ;-)))

  • Tado have introduced a new home/ away setting in the latest app. Just tap on the Home tile and select the mode that you want.
  • Thanks @AdyR , yes I saw that post. Think I'll still keep mine daisy-chained with my Nest for the time being tho (belt and braces ...)

  • Gijsvanderzon
    edited December 2020
    @sP1bOB does it work to your satisfaction? I have exactly the same situation and would like to do the same. Thanks for your respons!
  • Hi @Gijsvanderzon yes it worked perfectly and gave me more flexility.

    I have now changed my setup tho as I am now using the wireless extension kit, but I still use the Nest to connect to the "call for heat" side of my boiler to override the extension kit instructions.

  • Ok great @sP1bOB, so actually the only thing that you've changed on the already working NEST setup is putting the tado smart thermostat between the nest heat link and the boiler?

Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!