Pairing Gen3 with Amazon Alexa via Matter
Last updated: October 5, 2026
Product: Gen3 | Firmware: 5.1.4 or later | App: Mysa app 4.18 or later
This guide covers pairing your Gen3 thermostat to Amazon Alexa using Matter, what you can do once it is paired, Alexa voice commands, and Alexa-specific limitations. For an overview of Matter and links to other Gen3 Matter guides, see Gen3: Connecting to your Smart Home using Matter.
Before You Start
Your thermostat, the phone running the Mysa app, and your Alexa hub must all be on the same Wi-Fi network. If any are on a different or guest network, pairing may fail or the thermostat may appear unresponsive.
Using the same network name on a mesh extender is not enough if the extender is a different physical router. The phone, hub, and thermostat need to be on the same access point. If pairing fails on an extender, move the phone onto the same access point as the thermostat and try again.
Gen3 with the required Gen3 firmware version, online in the Mysa app.
Mysa app (iOS or Android) 4.18 or later, signed in.
The Alexa app on an iPhone or Android phone.
A Matter-compatible Alexa hub — most current Echo speakers, Echo Show displays, and eero routers support Matter. Older Echo (1st/2nd gen) and Echo Dot (3rd gen and earlier) do not.
Step 1 — Make Sure Gen3 Setup Is Complete
Install and complete setup for your Gen3 in the Mysa app.
Open the Mysa app and make sure your Gen3 is online and connected.
Confirm the Matter QR code is available for your thermostat after setup is complete.
Important: For Gen3, the Matter QR code is ready only after Mysa app setup is complete.
Step 2 — Add the Thermostat in Alexa
Open the Alexa app and tap Devices.
Tap the + button and choose Add Device.
Scroll down and select Other, then choose Matter.
Tap Yes on the “Does your device have a Matter logo?” question.
Scan the Matter QR code for your Gen3, or tap Enter setup code to enter the code manually if available.
Tap Connect to start connecting to the device.
Follow the Alexa pairing flow and set up the thermostat when prompted.
Rename the thermostat and add it to a room for voice control.
What You Can Do in Alexa
Feature | Available | Notes |
|---|---|---|
View current temperature | Yes | Shown on the device tile |
Adjust heat setpoint | Yes | Gen3 supports temperature control through Matter |
Heat / Off mode | Yes | Gen3 is heat-only |
Cool / Auto mode | No | Cooling modes do not apply to Gen3 |
AUX Heat / Fan Only | No | These HVAC modes do not apply to Gen3 |
Alexa voice control | Yes | Use supported temperature and Heat/Off commands |
Routines | Yes | Platform behaviour may vary |
Alexa Voice Commands
"Alexa, set the [device name] to 22 degrees."
"Alexa, what is the temperature on the [device name]?"
"Alexa, set the [device name] to heat."
"Alexa, turn off the [device name]."
Alexa Limitations
These come from the Matter standard and Amazon's implementation, not from a defect in your thermostat.
Gen3 Is Heat-Only
Gen3 supports Heat and Off through Matter. If Alexa displays other modes, do not use them; unsupported mode commands should not be used.
Alexa May List Extra Tiles
Alexa may list the thermostat plus a separate humidity device. That is expected Matter platform behaviour. Humidity voice commands may say the feature is not supported. Use Heat and Off on the thermostat device.
Voice Command to Turn Off Heat May Vary
If Alexa does not support a “turn off heat” command for your device, use “Alexa, turn off the [device name]” or change the mode to Off in the Alexa app instead.
May Show Unresponsive Before Mysa App Shows Offline
After a Wi-Fi drop, Alexa may flag the thermostat as unresponsive before the Mysa app shows it offline. This is normal.
Setpoint Increments
In the Alexa app, setpoints may be limited to whole-degree increments. If you need a more precise setpoint, set it in the Mysa app.
Re-Pairing After a Reset
Remove the thermostat from Alexa before re-pairing. Then pair again using the Matter setup flow for Gen3.