Nest Thermostat unable to update software

Nest thermostats update automatically when connected to the internet through Wi-Fi. If your Google Nest thermostat stalls, freezes, or gets stuck for more than 15 minutes during a software update, restart it to finish the update. The Nest Thermostat typically shows "g.co/nest/m21" if there is another software update problem.

Depending on your model, you can confirm the software version in the Google Home app, in the Nest app, or on the thermostat itself.

Important: Some software updates may take a few weeks to make it to all Nest thermostats that are connected to Wi-Fi.

Nest Thermostat software update error messages

If your Nest Thermostat is unable to update its software, it should show one of the following messages:

• "Unable to check"
• "No network"
• "Add account to check for updates"

These errors only apply to the Nest Thermostat. Nest thermostat software history contains notes about the latest version of thermostat software. For more details, go to How to tell which Nest thermostat you have and Nest thermostat software update history.

 

"Unable to check"

This message means there may be a temporary issue with the Nest service. Check for service issues. If there's an issue, try again when the issue is resolved.

"No network"

This means that your thermostat isn’t connected to a Wi-Fi network.

1. On your thermostat, go to Settings Network. If it's not connected to an account, remove your thermostat from the Google Home app.
2. Open the Google Home app .
3. Tap Home   Climate   your thermostat.
4. Tap Settings Remove device.

5. At the top right, tap Add Device .

   • Or, if a setup screen for your device appears, tap Set up or Next.
     • If it’s not the correct device, tap Not now or Set up a different device.
   .
6. Follow the app instructions and select Already installed to skip installation and wiring instructions. The app then connects your thermostat to your account and may ask you to select additional options like your preferred temperatures.

"Add account to check for updates"

If your thermostat isn’t connected to a Google Account, it can’t download updates. Someone may have manually disconnected the account in the thermostat settings, or there could be another issue.

1. On your thermostat, go to Settings Network. If it's not connected to an account, remove your thermostat from the Google Home app.
2. Open the Google Home app .
3. Tap Home   Climate   your thermostat.
4. Tap Settings Remove device.

5. At the top right, tap Add Device .

   • Or, if a setup screen for your device appears, tap Set up or Next.
     • If it’s not the correct device, tap Not now or Set up a different device.
   .
6. Follow the app instructions and select Already installed to skip installation and wiring instructions. The app then connects your thermostat to your account and may ask you to select additional options like your preferred temperatures.