Symptom:

After the router starts up, the following error message appears on the configuration terminal:

%Jun 22 16:11:37:485 2015 HPE DEV/4/FAN FAILED:
 Fan 1 failed.

Solution:

To resolve the problem:

• Verify that the fans are in position.
• Examine whether any obstacle enters the chassis and blocks the fans.
• Examine whether any fan stops rotating.
• Turn off the power switch.
• If the problem persists, contact Hewlett Packard Enterprise Support.

  — David Gonzalez 2021/03/30 12:49