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Nest thermostat

Community Member

Gold Product Expert
Gold Product Expert

The E294 error means your thermostat needs an R wire but there's a configuration issue. You'll need to reset your thermostat to factory defaults and add it back to the Home app. Be sure to enter the correct wiring info when re-adding it to the Home app. I'll put the detailed steps below. Hope it helps!

Reconfigure a W or R wire

  1. Open the Home app.
  2. Touch and hold your device's tile.
  3. At the top right, tap the Settings cog
  4. Tap Remove device> Remove
  5. On your thermostat, tap on the right side to open the menu.
  6. Swipe to Settings and tap to open.
  7. Scroll to Factory reset.
  8. Choose Reset and tap.
  9. Select Yes and tap.

Next, add your thermostat back to the Home app. Tap Add + at the top left of the home screen and follow the instructions on screen. Pay extra attention to the instructions when you re-enter your wiring info. If it's still not working, check that your system wires are connected to the right connectors. Use the wiring diagram the app gave you during setup to move the wires to the right connectors.

If you don't have the wiring diagram, refer to the picture of your thermostat wires that you took when it was installed. If you didn't take a picture or can't find it, follow these instructions to access your system's control board and take a picture of the wires. Use this picture to enter the wires into the app.

  1. Open the Home app.
  2. Tap Add + at the top left of the home screen.
  3. Tap Set up device and follow the app instructions until you get to the wiring step. Use the picture of your old thermostat's wiring to enter the wires into the app. 
  4. Move the wires to the right connectors to match the wiring diagram.
    • Make sure you have turned off power to your system at the breaker box, fuse box or system switch before you move the wires.
    • Make sure the wires have ⅓ to ½ inch of copper exposed, the wire is fully inserted into the connector, and that the wire connector button stays down.
  5. Replace the thermostat display and turn your system power back on.
  6. Turn power to your system back on at the breaker or fuse box.

Community Specialist
Community Specialist

Hello there,


Thanks for sharing the step-by-step instructions, @davidking. Big help!


@exclusive2, I hope you've seen @davidking's response. How's it going? Have you had a chance to follow the steps? Please let us know if that helps or if the issue still persists.




Hi exclusive2,


I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.



Community Specialist
Community Specialist

Hey exclusive2,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.