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, restarting your thermostat should let it finish. The Nest Thermostat will typically show "g.co/nest/m21" if there is another software update problem.
Depending on your model, you can confirm the software version in the 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"
Note: These errors only apply to the Nest Thermostat. Check which thermostat you have. Nest thermostat software history contains notes about the latest version of thermostat software.
Network. If it's not connected to an account, remove your thermostat from the Home app.
then Set up a Nest product.