The Power LED indicator is flashing constantly. What should I do?

Symptoms

The Power LED indicator on the front panel keeps flashing blue for more than 10 minutes.
The HA STATUS is off or blinking orange.
The IP address of Synology Unified Controller is missing in Synology Assistant.
The status changed to Warning and shows Unable to detect controller X in High Availability Manager > Overview when signed in to the Unified Controller.

Resolution

Check the Power LED indicator on the controllers

Refer to Hardware Installation Guide to check the status of the Power LED indicator on the controllers.

If the Power LED indicator keeps flashing blue for more than 10 minutes on both controllers, contact your reseller for repair or replacement. If Synology Replacement Service (shortened as SRS) is supported by your Synology Unified Controller and in your region, please refer to this article to complete the online replacement application form.
If the Power LED indicator keeps flashing blue for more than 10 minutes on only one of the controllers, go to Swap the controllers to test.

Swap the controllers to test

Please follow the troubleshooting steps below to find out the issue:

Make sure all the clients are disconnected. The service will be off during troubleshooting.
Power off your Unified Controller by pressing the power button for 3 seconds.
Follow the steps below to cross-test on the controller that is flashing the blue Power LED indicator.
- The Power LED indicator keeps flashing blue on Controller A.
  1. Pull out Controller-B.
  2. Power on your Unified Controller with Controller-A only and observe for more than 10 minutes.
  3. Power off your Unified Controller by pressing the power button for 3 seconds.
  4. Swap Controller-A to another slot (Slot-B).
  5. Power on your Unified Controller with Controller-A only and observe for more than 10 minutes.
- The Power LED indicator keeps flashing blue on Controller B.
  1. Pull out Controller-A.
  2. Power on your Unified Controller with Controller-B only and observe for more than 10 minutes.
  3. Power off your Unified Controller by pressing the power button for 3 seconds.
  4. Swap Controller-B to another slot (Slot-A).
  5. Power on your Unified Controller with Controller-B only and observe for more than 10 minutes.
- Put both Controller-A and Controller-B back into the original slot (Controller-A for Slot-A, Controller-B for Slot-B) and power on your Unified Controller.¹
- Swap Controller-A and Controller-B and power on your Unified Controller.¹
Check the test result:
- If the controller with a flashing Power LED indicator cannot power on both slots, then the controller may have issues. Contact your reseller for repair or replacement. If Synology Replacement Service (shortened as SRS) is supported by your Synology Unified Controller and in your region, please refer to this article to complete the online replacement application form.
- If both controllers cannot power on the specific slot, then the slot may have issues. Please contact your reseller for repair or replacement. If Synology Replacement Service (shortened as SRS) is supported by your Synology Unified Controller and in your region, please refer to this article to complete the online replacement application form.
- If you cannot identify the issue, go to the next step.
Sign in to your Synology Account and create a support ticket to get assistance from our Technical Support Team.

Notes:

If one of the controllers is replaced by RMA, refer to this article to boot up your Unified Controller with the original controller. Connect the replaced controller and power on your Unified Controller.

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