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Heat no longer works on Nest Learning Thermostat

ReedB6320
Community Member

‎11-21-2023 07:16 PM

Hi, I'm a newbie to this forum so hello and thanks in advance for all help!

I had a Gen 3 Learning Thermostat installed six months ago and originally, the manual ring settings for both forced air AC and heat modes appeared on the LED screen and worked fine, but now, no heating mode shows up on the screen and heat doesn't work. Attached are images showing: Current Equipment Detected (4), Current Equipment Sensed (4), Current Checked Wires (4), and Actual Wire Connections (shows 5!).  Obviously, the white wire that should be the heat, isn't being recognized by the Nest anymore. Arg!

I've restarted the Nest and got the same results. Any suggestions on how to fix? Why would the wiring work manually for months, but then just delete the heat system function?

Current Equipment DetectedCurrent Equipment DetectedCurrent Equipment SensedCurrent Equipment SensedCurrent Checked WiresCurrent Checked WiresActual Wire ConnectionsActual Wire Connections

On another note (and I'll post separately after this issue gets fixed), is how to get the iOS Nest app working on my iPhone11 that has the correct software. Been having trouble setting up. Google specs show they're compatible. OK, maybe not every function but at least AC and Heat, but I can't get 'em to talk to each other.  Computers, huh? Love em!

Thanks again for all help!

 

 

 

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Markjosephp
Community Specialist
Community Specialist

‎12-05-2023 10:06 AM

Hello ReedB6320,

Welcome to the forum! It's great to have you here, and I'm sorry to hear about the issue you're experiencing with your Nest Learning Thermostat.

First, kudos on providing detailed information about the equipment and wiring. It makes troubleshooting much easier. From what you've shared, it seems like the Nest Thermostat is not recognizing the white wire responsible for the heat system. Here are a few suggestions to troubleshoot the issue:

 

  • Check the wiring connections.
    • Turn off the power to your HVAC system.
    • Double-check the connections at both the thermostat and the HVAC control board.
    • Ensure that the white wire (W) is securely connected at both ends.
  • Inspect the white wire:
    • Examine the white wire for any signs of damage or wear.
    • If the wire looks damaged, consider replacing it.
  • Re-seat the white wire:
    • Disconnect the white wire at both ends and then reconnect it.
    • Sometimes, re-seating the wire can establish a better connection.
    • Pushed the tab to make sure it's locked.

 

Feel free to share updates or ask more questions as you work through these steps.

Regards,
Mark

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