When the thermostat fails to restore the connection, it will remain in the eco mode if you have set it. In addition, the thermostat stays within the safety temperatures to prevent it from becoming too hot or too cold in your home.
When you try to connect the Nest thermostat yourself, check the points below.
- Check whether the Wi-Fi network in the house is working properly.
- Check the status of the Nest service.
- Check whether the Nest app is still up to date.
- Check the battery level of the Nest thermostat.
- Restart the Nest thermostat.
- Restart the router.
- Check whether there is wireless interference.
- Reset the thermostat's network settings.
- Check the settings of your Wi-Fi router or access point.
- Check Nest’s list of incompatible devices.
You can also read this on the Google Nest website.