Amazon Smart Thermostat Installation Isn't Working

Try these troubleshooting tips to fix installation issues with the Amazon Smart Thermostat.

Important: Before working on the thermostat, always switch off the power to the heating and cooling system at the breaker box or by using the system's primary power switch. Verify that the power is off before beginning installation.

The Wires Are Connected, But the Device Isn't Getting Power

  • Ensure that the thermostat is compatible with your HVAC system. Go to Does Amazon Smart Thermostat Work with My System? for more information on compatibility.
  • Check that the power to the HVAC system is turned on at the circuit breaker or system switch.
  • Ensure the circuit breaker or fuse to the HVAC system wasn't blown during installation. The breaker or fuse can blow if power wasn't turned off first, or if wire tips touched during installation.
  • Remove the thermostat faceplate and check that your wiring connections match the directions in the Alexa app installation instructions. If you took photos of the wiring during installation, refer to the photos to make sure that the wiring configuration matches that of your old thermostat.
  • Remove the thermostat faceplate and gently check that each wire is well connected. To be sure, you can remove and reconnect each wire.
  • Remove the thermostat faceplate and check the R jumper switch, the blue jumper cover at the lower right corner:
    • If you have one R-wire, make sure it's connected to the R terminal (not to Rc), and that the R jumper switch is in the up position.
    • If you have two R-wires, they should connect to R and Rc, and the jumper switch should be in the down position.
  • Did your previous thermostat have batteries? If so, and you connected a C-wire to your new thermostat, the C-wire might not be connected correctly at your HVAC control board. At your HVAC control board, check that the wire matching your thermostat C-wire connects to the terminal labeled "24 V Common."

The Thermostat and the HVAC System Didn't Connect with Each Other

  • If the thermostat display shows SEt with a blinking yellow light, the thermostat might need to install updates first. You can allow a little time for updates to install before retrying installation.
  • Try to force update the software: remove the thermostat faceplate and put it back after 30 seconds.
  • Close the Alexa app and restart. If the Thermostat device page has a notification that installation failed, try to reinstall the Thermostat. If that fails, contact Customer Support.

The Thermostat Isn't Connecting with Alexa

  • Ensure that the WPA3 setting is turned off for your router. For eero routers, check the WPA3 setting on the device settings page. For other routers, contact your router's manufacturer for instructions.
  • The thermostat requires 2.4 GHz Wi-Fi to operate; 5 GHz Wi-Fi isn't compatible.
  • Download or update the Alexa app from your device's app store.
  • Check that the thermostat connects to your Wi-Fi network. Rebooting the Wi-Fi router can also be helpful.
  • Try removing the thermostat from your Alexa app and then reinstalling with a partial reset. See Reset Your Amazon Smart Thermostat and Keep Your HVAC Connections.
  • Try removing the thermostat from your Alexa app and then reinstalling with a full factory reset. See Reset Your Amazon Smart Thermostat.