Flashing yellow light on AirPort Express

Status message says "was part of network" but now "device not found". It asks has the airport moved (out of range) or does it have power. Neither the Mac, router, or airport have moved or lost power. Nothing has changed. And the firmware 6.3.7 (8/2017) seems the most current. Now what? And what causes this?

Hello seaforanswers,

I was looking through our resorces about what might be going on here and found a great article for troubleshooting that flashing amber light. It is called Wi-Fi base station: Understanding and resolving a blinking amber status light and you can find it here: http://support.apple.com/kb/TS1589.

How to resolve a blinking amber status light alert

Launch AirPort Utility to determine why your Wi-Fi base station status light is blinking amber. 
Apple recommends that you use AirPort Utility 5.5.2 for Mac, AirPort Utility 5.5.2 for Windows, or a newer version of AirPort Utility if one is available.

1. AirPort Utility 5.2 or later opens automatically if your Wi-Fi base station requires your attention. You may also choose to launch AirPort Utility at any time.
 Do not use any version of AirPort Utility earlier than 5.0.
   In Mac OS X, AirPort Utility is located in the Applications > Utilities folder.
   In Microsoft Windows, AirPort Utility can be located by clicking Start > All Programs > AirPort.
   Note: You may also locate and download the latest Wi-Fi base station firmware and software by clicking here.
2. In the AirPort Utility window, locate your Wi-Fi base station and double-click on it to open the Summary window. Note: If you have more than one Wi-Fi base station, double-click on the icon for the Wi-Fi base station that has the amber circle next to it.
3. When the Summary window appears, double-click the amber circle to the right of Wi-Fi base station Status to open the Status window.
4. The Status window lists any conditions that require your attention. Respond to each item until there are no more items listed.
   Important: You must reset the Wi-Fi base station using the reset switch to re-enable checking for the conditions you ignored.
5. Eliminating the blinking, amber status light may require making changes to a specific setting, or putting a checkmark in the "Ignore" checkbox beside any option you don't wish to change. A checkmark simply tells the AirPort that you are aware of the issue and you have chosen to ignore it. For example, you may wish to leave your AirPort open without a password so that anyone can join your wireless network.
6. Click Update to apply your changes (the Wi-Fi base station will restart).
7. After the Wi-Fi base station has restarted, the status light should be green and not blinking. If the status light stays amber in color and blinks after the Wi-Fi base station restarts, you may repeat the steps above.

Take care,

Sterling

I've been searching for the answer to this, too. I've been through all the steps that the troubleshooting article recommends, many many times, to no avail. Searching the threads on this site, I haven't found an answer that wasn't just replacing the unit. I have tested the modem, can connect directly to it with my computer, have swapped and tested the cables, and everything works except for these error messages from the Airport Extreme.

Big thanks. This post solved my blinking light problem.

Yaaay!

My pleasure dirtPath

This is some time later June 2016 -

I have Airport Express and am running Mavericks.

I could not get rid of the flashing light until

I opened the AirPort Utility in the Applications folder and

got a notice that I needed a FIREWARE UPDATE !

It would not tell me that without going to the actual app icon in UTILITIES FOLDER! Stupid much !

Now what is wrong with Apple that when one does diagnostics 25 times

that it doesn't tell

one needs a firmware update is a completely mystery to me!

Sheesh !

This was MOST helpful, it fixed the problem right away. Thanks for sharing the tip.

I'm feeling a big duh-h-h. Thanks for this. It worked (of course.)

This was my problem too, needed a firmware update. And I'm also surprised I had to "go there" to figure this out.