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Google Nest Thermostat won't connect to wifi: what to do

Thermostat fails to join Wi‑Fi during setup or loses connection while setting up.

Most likely causes

usually this

Wrong Wi‑Fi name or password

  • Ensure you selected the correct Wi‑Fi network in the app.
  • Re-enter the Wi‑Fi password exactly, watching for capitals and spaces.
  • Test the password by connecting your phone to the same network.
common

Thermostat too far from the router (weak signal)

  • Place a phone or laptop near the thermostat to check signal strength.
  • Temporarily move the router closer or use a Wi‑Fi extender.
  • Try setup again with fewer walls between thermostat and router.
common

Router uses only 5 GHz or network settings block the device

  • Check your router for separate 2.4 GHz and 5 GHz networks; Nest often works better on 2.4 GHz.
  • If you have separate SSIDs, pick the 2.4 GHz network in the app.
  • Disable MAC filtering or guest-network restrictions, or add the thermostat to allowed devices.
sometimes

Thermostat holds old or corrupted network info

  • Restart the thermostat from Settings > Restart on the device.
  • If available, clear the network data in Settings > Network and re-enter Wi‑Fi details.

Factory reset

Warning: a factory reset erases personal settings, schedules and Wi‑Fi details. Write down your wiring and important settings first.

  1. On the thermostat open the menu and go to Settings.
  2. Select Restart or Factory Reset (or Settings > Reset on older models).
  3. Choose 'Factory Reset' and confirm that you want to erase the device.
  4. 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 is offlineNest Thermostat resetFirst-time setup

Sources

Updated 2026-09-09 · plugfix.vercel.app