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The "%SYS-2-FAN_FAIL" error message is displayed in the logs of a Catalyst switch

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Core issue

The SYS-2-FAN_FAIL message indicates the chassis fan failed.

Resolution

Re-seat the fan tray. If this does not resolve the issue, replace the fan tray.

To determine if the part is in the affected products list, refer to Field Notice: Catalyst 4500 Series Chassis Fan Tray Recall.