Ready to learn what your AT&T Smart Wi-Fi Extender (4921 & 4920) LED lights mean?
Then, you're in the right place! First, connect an Ethernet cable from any of the ports on the back of your Wi-Fi extender directly to your Wi-Fi gateway:
- If you get a solid white light, the pairing process has completed.
You can disconnect the Ethernet cable and place the extender in a new location.
- If you get a solid red light:
• Be sure you’re not connecting through a 3rd party router
• Make sure there aren’t any devices connected by Ethernet to your extender when powering on
• Be sure you have ordered Extended Wi-Fi Coverage service. Check your AT&T Internet service account.
Learn more about your AT&T Smart Wi-Fi Extender (4971) and all of our Wi-Fi Gateways & Equipment.
What do these Front Service LED colors mean on the AT&T Wi-Fi Extender (4921)?
LED color | State | Meaning |
OFF | OFF | No power. Make sure the Wi-Fi extender is plugged in and turned on. |
LED color | State | Meaning |
Green | Blinking Green | Ready to connect to your Wi-Fi gateway. First time connecting? Wait 5 minutes and follow the Wi-Fi Protected Setup (WPS) pairing guidelines. |
Solid Green | Connected to your Wi-Fi gateway. |
LED color | State | Meaning |
Green & Red | Flashing Green & Red | Connected but too far from your Wi-Fi gateway. Depending on your BB service speed move your Wi-Fi extender closer to your gateway. |
LED color | State | Meaning |
Red | Blinking Red (Slow Blink) | Lost connection or couldn’t connect through Wi-Fi Protected Setup (WPS). Move your Wi-Fi gateway closer and press the WPS button again. |
Blinking Red (Medium Blink) | Extender is resetting and may take up to 5 minutes to power on. | |
Solid Red | Couldn't connect to the paired gateway or it's connected to an unsupported third-party router or smart device by Ethernet. Disconnect all Ethernet connections. Then, connect the extender by Ethernet just to your Wi-Fi gateway. |
LED color | State | Meaning |
Amber | Blinking Amber | Checking for updates. Don’t move the Wi-Fi extender or turn it off. |
What do these Front Service LED colors mean on the AT&T Wi-Fi Extender (4920)?
LED color | State | Meaning |
OFF | OFF | No power. Make sure the Wi-Fi extender is plugged in and turned on. |
LED color | State | Meaning |
White | Blinking White | Checking for updates. Don’t move the Wi-Fi extender or turn it off. |
Solid White | Wi-Fi extender has power. |
LED color | State | Meaning |
Green | Blinking Green | Powered on and ready to connect to your Wi-Fi gateway. First time connecting? Wait 5 minutes and follow the Wi-Fi protected Setup (WPS) pairing guidelines. |
Solid Green | Connected to Wi-Fi gateway for internet availability. |
LED color | State | Meaning |
Green & Red | Flashing Green & Red | Connected but too far from your Wi-Fi gateway. Depending on your BB service speed move your Wi-Fi extender closer to your gateway. |
LED color | State | Meaning |
Red | Blinking Red (Slow Blink) | Lost connection or couldn’t connect through Wi-Fi Protected Setup (WPS). Move your Wi-Fi gateway closer, and press the WPS button again. |
Blinking Red (Medium Blink) | Your Wi-Fi extender is resetting and may take up to 5 minutes to power on. | |
Solid Red | Couldn't connect to the paired gateway or it's connected to an unsupported third-party router or smart device by Ethernet. Disconnect all Ethernet connections. Then, connect the extender by Ethernet just to your Wi-Fi gateway. |
Read the latest AT&T Internet & AT&T Fiber equipment solutions...
FAST. EASY. ONLINE.
Shop the way you want
Same-day pickup
Order online and pick up
safely in-store or curbside today.
Subject to
availability.
Same-day delivery
Get delivery and optional
expert setup as soon as today with AT&T Right To YouSM. All
free.
Select markets only. Same-day delivery subject to
availability.
Free shipping & returns
Shop online with free shipping and returns.

Visit the Community How-To.