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Sensor issue

Community Member

I have had a Nest Learning Thermostat and 1 sensor for 4-5 years. Recently I had to replace the battery in the sensor. Now the thermostat can't find the sensor. I deleted the sensor and started from scratch to add the sensor. Whenj trying to set up the sensor I get a message saying I need a Nest thermostat, which I have and appears to be working perfectly! Any suggestions?



Community Specialist
Community Specialist

Hi Boz3,


Thanks for posting ― let's get this sorted out.


Give these steps a try:


  1. Try 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.
  2. 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.
  3. Check the battery charge. The Nest app will send you a notification before the battery is fully drained, so you should have plenty of time to replace it.
  4. 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.

Keep us posted.





Hey there,

Checking back in should you still have some questions here. Let us know by replying to this thread. 


Community Specialist
Community Specialist

Hi everyone,

@Boz3 just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

I appreciate the help, Mel.