This occurs when your router is not providing the correct IP address to your ecobee. To resolve this, follow the steps below:
- Remove your ecobee3 lite from the backplate.
- Unplug your wireless router, and wait 1 minute.
- Reconnect your wireless router.
- Put your ecobee3 lite back on the your backplate.
After roughly 1 minute, it will connect to your wi-fi. If it has not connected after 1 minute, tap the Menu icon on your thermostat. Select Settings > Wi-Fi. Select Enable and input your wi-fi password to reconnect your ecobee3 lite to the wi-fi.
If your ecobee3 lite is still not connecting to the server, please contact ecobee support for further troubleshooting.