Time capsule

A persistent, flashing amber light indicates that any of the these potential conditions may require your attention:

1. The base station has not yet been configured because it is new, or it has been reset.
2. You have selected a security configuration that is not recommended.
3. A new firmware update is available for the base station.
4. One of several other conditions, such as a disconnected Ethernet cable or invalid IP address has been detected.

Ref:

• About the status light on AirPort base stations - Apple Support
• If your base station's light is flashing - Apple Support

To find out why your base station's status LED is flashing amber:

• Open AirPort Utility
• Click on the AirPort base station
• Look for a Status setting in the small window that appears. Note: Status only appears if there is an issue or notification.
• Click on the small amber dot there and another window will open to explain what the "issue" might be.

The first order of business is to find out why the amber light is blinking..

Open AirPort Utility on your Mac (Finder > Applications > Utilities > AirPort Utility)

Click on the picture of the Time Capsule and another smaller window will appear

If....you see an "Update" button, click on it to update the firmware of the Time Capsule to the most recent version.

Otherwise......look for the Status label, then click on the small amber dot there for more information about what the issue might be. Post back with the exact text of that message.