This happens when your sensors aren't close enough to your thermostat to communicate, or if your sensors aren't communicating with your thermostat. To re-establish the connection, move your sensors closer to your thermostat, or try the following steps:
- Remove back cover from the sensor.
- Remove the battery.
- Wait for 2 minutes.
- Reinsert the battery.
- Wait for 5 minutes.
- Check whether the temperature/occupancy data has been updated.