Hello there, Rodrigo. We appreciate your feedback, and we’re sorry to hear that your experience with the Nest Learning Thermostat along with the Nest Temperature Sensors has not been ideal.
A range issue or wireless interference can cause your sensor to disconnect from your thermostat. In these cases, your thermostat will automatically default to using its own temperature sensors. We suggest moving your sensor a bit closer to your thermostat. Sometimes it may pass the connection test during setup, but will struggle to stay connected if it’s just a bit too far away. Check the battery charge. The Google Home app or Nest app will send you a notification before the battery is fully drained, so you should have plenty of time to replace it. If the battery still has a charge, try removing it for 10 minutes. This lets power drain completely from the sensor and forces it to reset. Then put the battery back in and check if the sensor has reconnected in the Nest app. Check for objects such as mirrors and refrigerators between the sensor and your thermostat. These items could block the connection. For more help, read Troubleshooting wireless interference: https://support.google.com/googlenest/answer/9276282
For additional support, don’t hesitate to contact us here: https://support.google.com/googlenest/gethelp