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:

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

— David Gonzalez 2021/03/30 12:49