Troubleshooting a “Failed to connect” error on your Nest thermostat

Here are some steps you can take if your Google Nest thermostat is having trouble connecting to a Wi-Fi network for the first time, or after you’ve made some changes to the network.

You might see a Failed to connect error when you:

  • Install your Nest thermostat and try to connect it to
    Wi-Fi for the first time

  • Re-connect your thermostat to a network whose
    name or other information has changed

  • Select a different network to connect your
    thermostat to, if it was previously connected to one

failed to connect thermostat image

Note: If your thermostat was previously connected to Wi-Fi and you didn't change anything about your network, or if you're trying to troubleshoot a different Nest product, visit our article about troubleshooting Wi-Fi and connection issues.

1. Restart your thermostat 

Simply restarting your thermostat can give it a fresh start to try again after it failed to connect.

            How to restart your thermostat >

After your thermostat has finished restarting, try to connect it to Wi-Fi.

2. Reset and check your home's internet connection 

Here are some general instructions for resetting your home's internet connection

Tip: Keep in mind, your equipment may be different from what's described below. When in doubt, check the user guide for your specific router, modem, and other internet devices to learn how to reset them.

  1. Unplug your modem and router power cords. You may have a combination modem/router, or they may be separate devices. All the lights on your modem and router should be off.

  2. Wait for 30 seconds, then plug your modem and router back in.

  3. Your modem and router will restart. Wait a couple of minutes or until you see steady power and connection lights. You may also see a quickly flashing data light.

  4. If you have any Wi-Fi range extenders or repeaters, restart them as well.

  5. Once you've reset your internet connection, test the connection:

    • Use another device like a phone or laptop to go online and visit a website.

      Note: If you're using a phone to check your connection, don't use cellular data. Instead, switch your phone to Airplane Mode, then turn on Wi-Fi only.

    • You can also check whether any of the other Wi-Fi products in your home are able to connect. For example, if you have a smart speaker like Google Home, a connected TV, or a connected lighting system, check whether it's able to connect.

    • If nothing works, contact your internet service provider for further troubleshooting.

Once you're able to confirm that Wi-Fi is working, try connecting your thermostat.

Tip: You can try temporarily connecting your thermostat to another available network. This can help you diagnose possible issues. If an open Wi-Fi network isn't available, you can create a Wi-Fi hotspot with your phone. For instructions on how to do this, refer to your phone's manual.

3. Reset your thermostat's network settings 

Your thermostat might have some incorrect network settings that are preventing it from connecting to Wi-Fi. Try clearing these settings.

Press the ring to open the Quick View menu and then Settings Nest settings icon and then  Reset and then Network Settings and then Reset.

Then try again to connect your thermostat to Wi-Fi.

4. Check the settings on your Wi-Fi router or access point 

Incompatible settings on your home's router or access point can cause your thermostat to be unable to connect to Wi-Fi.

For example, high firewall security or parental controls can block your thermostat from connecting to Wi-Fi. Refer to your Wi-Fi router or access point's documentation to see how you can exempt your Nest thermostat from these restrictions.

If you still can't connect your thermostat after checking your parental controls or lowering your firewall, make sure you're using settings that allow your thermostat to connect to your home Wi-Fi. See the article linked below for detailed router setting recommendations.

           Recommended Wi-Fi settings >

If you changed any settings, try again to connect your thermostat.

5. Check the incompatible list 

After trying all the suggestions above, if you're still having trouble connecting your thermostat Wi-Fi, check that your router or modem is not on the incompatible list.

          Wi-Fi routers that are incompatible with Nest products >

Note: Even if your router is on the incompatible list, some incompatibility problems can be resolved by updating the router firmware (see your router’s manual for instructions) or changing the router settings. See the section above about checking the settings on your Wi-Fi router or access point.

6. Check for interference 

Try turning off any devices that operate on a 2.4 GHz frequency, then try connecting your thermostat again. Here are some devices that might cause problems:

  • Cordless phones

  • Baby monitors

  • Microwaves

  • Bluetooth devices

  • Wireless video equipment

For more information and steps to take to troubleshoot wireless interference, see the article below.

       Learn about wireless interference and how to troubleshoot it >

After turning off any sources of interference, try connecting your thermostat to Wi-Fi.


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