Amazon Smart Thermostat Installation Guide

Installing Amazon Smart Thermostat

If you are not comfortable working with electrical wiring or your home heating and cooling system, contact an HVAC service company to install and set up your Thermostat.

Important: Before starting work on the Thermostat or the heating and cooling system (HVAC), always switch off the power to the HVAC at the breaker box or the system’s primary power switch. Verify the power is off before removing the device faceplate. Do not touch any exposed wire ends.

  1. Remove the faceplate or box from your old thermostat. Before disconnecting any wires, take a picture of the wiring connections for later reference.
  2. Look for any of the following indicators that your system is high-voltage:
    1. Warning labels that say 110v or 220v
    2. Wires labeled L1 or L2
    3. Wires connected by wire nuts (screw-on caps)If you see any of those high voltage indicators, the Amazon Smart Thermostat won’t work with your system.
  3. Make careful notes of which terminals have wires connected. Take a photo with your phone for reference, including the terminal labels.
  4. Remove one wire at a time. Use the stickers that came with your Amazon Smart Thermostat to label each wire with the terminal it came from. Repeat until all wires have been removed and labeled. Don’t let the labeled wires fall back into the wall.
  5. Make sure there is a wire for the C terminal, which provides power from the HVAC system to the Thermostat. If you have no wire for the C terminal, some newer homes might have an unused wire behind the wall plate. If there is no unused wire to convert to a C wire, a C-Wire Adapter is required. We recommend the adapter compatible with the Amazon Smart Thermostat. If you find an unused wire, label it with the C sticker, and connect the other end of that wire at your HVAC system’s control panel to the C terminal, sometimes labeled as “24V” or “24 common”. Then connect the end at the Thermostat to the C terminal.
  6. Remove the wall plate from your old Thermostat. Install the Amazon Smart Thermostat optional trim plate if you want, and then install its wall plate so the labeled wires can come through.
  7. When the wall plate is fastened to the wall, connect each labeled wire from the wall into the slot as directed in the Alexa app. Refer to the labels, and the picture you took if needed. After connecting, gently tug each wire to make sure they’re connected. Make sure the R terminal switch is in the up position.
  8. Close the wire cover on the wall plate. Then align the Amazon Smart Thermostat faceplate with the wall plate and press together gently until it clicks into place.
  9. Turn the heating/cooling system power back on at the breaker box or switch where you turned it off.

If the Thermostat shows SEt or the temperature, it’s successfully installed. If nothing shows on the Thermostat, turn off the system power, remove the faceplate and make sure all the wires are connected properly. Then turn the power back on.

Connect a C-wire Adapter to Your Amazon Smart Thermostat

Amazon Smart Thermostat C-wire Installation Guide

Important: Before starting work on the Thermostat or the heating and cooling system (HVAC), always switch off the power to the HVAC at the breaker box or the system’s primary power switch. Verify the power is off before removing the device faceplate. Do not touch any exposed wire ends.

  1. With the Thermostat faceplate off, take a photo of the wiring and wire labels, for later reference.
  2. Go to your HVAC system and remove the cover to reveal the control board. Take a photo of the wiring, labels and terminal connections there for reference.
  3. Find and label the wires connected to these terminals:
    • G
    • W or W1 – If you have a heat pump, there may be wires at the O, B or O/B terminal instead of W.
    • R or Rc
    • Y or Y1
    If a terminal has multiple wires connected, label only the wire running to your Thermostat.
  4. Disconnect only the wires you just labeled from the control board.
  5. In the C-wire Adapter, insert the disconnected wires into these terminals on the “Thermostat” side of the adapter:
    • W or O/B wire to W terminal
    • G wire to C terminal
    • R or Rc wire to R terminal
    • Y or Y1 wire to K terminal
  6. Connect the wires from the “Equipment” side of the adapter to the matching terminals on the HVAC control board. Place the adapter near the control board and close the HVAC cover.
  7. At your Smart Thermostat, label the G wire as C, and label the Y wire as K. Disconnect those two wires and then reconnect them into the matching C and K terminals.When you’re done wiring, you should have wires in the C and K terminals, and no wires in the Y or G terminals.
  8. Close the wire cover on the wall plate, then attach the Thermostat faceplate. Turn on the power to the HVAC system, at the breaker or system switch. If the Thermostat display shows SEt or the temperature, it’s connected successfully.

Setting Up Amazon Smart Thermostat

  1. On your mobile device, open the Alexa app .
  2. Open More  and select Add a Device .
  3. Under All Devices, select Thermostat .
  4. Under What brand is your thermostat?, select Amazon.
  5. Under Has your thermostat already been installed on the wall?:
    • Select No for guided instruction in the app on how to connect the wiring and install your Thermostat.
    • Select Yes for instruction in the app on how to connect your Thermostat to Wi-Fi and to Alexa.

Note: During setup and connection with Alexa, the Thermostat might send a configuration failure notification to your Alexa app. In most cases, this failure can be resolved by restarting the Thermostat, so it can install any updates. To restart, remove the faceplate from the wall plate, wait a few seconds, then gently reattach it. If you then receive another configuration failure notification, contact Customer Support.

What Do the Display Lights on Your Amazon Smart Thermostat Mean?

Learn about device icons and buttons in the Alexa app.

  1. Open the Alexa app .
  2. Open Devices and select Thermostat .
  3. Under Thermostats, select your Smart Thermostat.
  4. Select Settings .
  5. Select Thermostat configuration.
  6. Select Thermostat icons.
  7. Tap icons on the screen display for descriptions of their functions.

Note: The Info icon on the left of the display means you have an alert or notification about your thermostat. When it appears in red, yellow, or green, go to the Smart Thermostat page in your Alexa app.