Troubleshoot a 'Failed to connect' thermostat message

Here are some steps that 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.

Failed to connect message may appear when you:

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

  • Reconnect 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 

If your thermostat fails to connect, restarting it can help to get it working again.

How to restart your thermostat 

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

2. Check and reset your home's Internet connection 

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

Tip: Bear in mind that your equipment may be different from what's described below. If 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. You may have a combination modem/router, or they may be separate devices. All of 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 there's steady power and connection lights. There may also be 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 mobile data. Instead, switch your phone to Flight 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 to connect 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 prevent it from connecting to Wi-Fi. Try to clear 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 learn how you can exempt your Nest thermostat from these restrictions.

If you still can't connect your thermostat after you've checked your parental controls or lowered your firewall, make sure that you're using settings that allow your thermostat to connect to your home Wi-Fi. Check the article 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 

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 (check your router’s manual for instructions) or changing the router settings. Refer to the section above about checking the settings on your Wi-Fi router or access point.

6. Check for interference 

Turn off any devices that operate on a 2.4 GHz frequency, then try to connect 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, refer to the article below.

Learn about wireless interference and how to troubleshoot it 

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

7. Reset your thermostat

If the above steps don’t work, you can reset your thermostat to factory settings and re-add it to your account.

Important: Before you reset your thermostat, record any current settings that you will need to remember for setup and your preferred settings like Eco Temperatures. If a pro installed your thermostat or you have an advanced system (dual fuel, humidifier, etc.), you may need to contact a pro to make sure that your thermostat is set up correctly. 

Follow the steps in the article linked below and choose All settings to factory reset your thermostat. You will then need to go through thermostat setup again.

How to reset or restart your thermostat


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