Dual Zone Nest Setup on Google App

[mattnicomn]

This post is to help someone else out. I solved my issue, but I'm posting to maybe help someone else that is having the same issue. It'll save them hours of research and headache.

Setting up Nest on Dual zone/Dual Thermostat HVAC system(one upstairs and one downstairs)

What I have set up in my home is a dual zone thermostat system. I had issues connecting them on the google home app. If you try to connect them through the nest app, it will just redirect you to the google home app. The process to install these two separate thermostats.

1. Install the devices on each panel through the installation guide.

2. Install one thermostat at a time with the app. ( You should install both thermostats physically on the wall before hand)

3. Once you have one thermostat fully installed and programed, delete it from your google home app.

4. Once deleted, unplug the thermostat from the wall and complete the installation on the google home app for the second thermostat. (If you started the install on google home app with the second one like I did, tap the side of the nest twice to access the menu and go to setting to delete/remove your account from the nest or factory reset it. I just remove the account from the second nest and completed the installation process.)

5. It might take some time to connect, but it should be all set to go!

Lesson Learned:

In order for addition device to connect to the smart home network with your other google products, they need to be updated, then you can add all the devices you want to your existing network.

[GeorgannaS]

I just purchased a second Nest thermostat for my second zone (upstairs).  I’ve been trying to set it up on the Google Home app and keep getting the error “not compatible with my system “.  My downstairs Nest has worked (with several battery replacements 🙄) for over a year. Do I need to delete my first Nest thermostat and restart it then install the new Nest Thermostat?  Btw Nest Customer Service recommends hiring a specialist to install.  

[mattnicomn]

Yes, I would reset the one downstairs and have the one upstairs setup completely before trying to add the one downstairs back to the app. The Nests need to update and be fully online before both of them will would. On a side note, it may be giving you that error from the zone controller. The zone controller I have is the Honeywell HZ221. Nest seems to be compatible with most systems. Also, it you have issues finding the zone controller. Mine was located in the attic off to the side of the A/C unit. Let me know if this helps!