Google Nest Thermostat is offline: what to do
Thermostat was online before but now shows as 'offline' in the app or does not respond.
Most likely causes
usually this
Router or internet is down
- Check other devices to see if they have internet.
- Restart your router/modem briefly.
- Contact your ISP if the outage affects all devices.
common
Thermostat lost Wi‑Fi after router changes
- Open the Google Home app and confirm the thermostat shows offline.
- Verify the thermostat still has the correct Wi‑Fi settings via Settings > Network if available.
- Restart the thermostat from Settings > Restart.
sometimes
Thermostat was removed or unlinked from your Google account
- Check the Home app to see if the thermostat is still linked to your account.
- If unlinked, add the thermostat again using the app setup process.
Factory reset
Warning: a factory reset erases personal settings, schedules and Wi‑Fi details. Write down your wiring and important settings first.
- On the thermostat open the menu and go to Settings.
- Select Restart or Factory Reset (or Settings > Reset on older models).
- Choose 'Factory Reset' and confirm that you want to erase the device.
- Wait for the thermostat to reboot. Then add it again to the Google Home app as during first setup.
Frequently asked
Will a restart delete my settings?
No. A restart simply reboots the device and keeps your schedules and Wi‑Fi details.
Should I remove the thermostat from my account before resetting?
It's recommended: remove it from the Home app before a full factory reset.
Does Nest work on 5 GHz?
Some Nest thermostats work but they are often more reliable on 2.4 GHz; try 2.4 GHz first if you have problems.
Do Nest Temperature Sensors stay linked after a reset?
Sensors linked to your account usually remain linked, but check them in the app after resetting.
Other problems with this device
Nest Thermostat won't connect to wifiNest Thermostat resetFirst-time setup
Sources
Updated 2026-09-09 · plugfix.vercel.app