Troubleshooting when your Nest thermostat disconnects or is offline in the Nest app
When your Nest products are disconnected from Wi-Fi, they appear as Offline in the Nest app. You won’t be able to control them with the Nest app until you get them back online again.
Here are some quick fixes to get Nest products back online:
Make sure your home Wi-Fi network is working. Try going online with another device and visiting any website. On a phone, make sure you’re testing the connection with Wi-Fi only (not cellular data). If the entire network is down, you’ll need get to the root of the issue before you can bring your Nest products back online.
Go to Nest’s support site and check the status of the Nest service. If it’s down, wait for it to resume.
Restart your Wi-Fi router. Unplug your router, wait 30 seconds, and plug it back in. After it boots up, you’ll see steady power and connection lights and your thermostat can try to reconnect.
Check for Wi-Fi interference. Try turning off other devices in your home that may be interfering with the Wi-Fi signal: cordless phones, baby monitors, microwaves, Bluetooth devices, and wireless video equipment.