Chassis power supply failure after a power outage

• FAS/AFF Systems
• ONTAP 9 
• Power Supply Unit (PSU)
• Power Distribution Unit (PDU)

• After a power outage, there is no power input to the system to boot the nodes.
• Amber LEDs are seen on the chassis power supplies.
• The power source to the PSUs is verified by connecting to an alternate PDU.
• Reseat of the power supplies does not bring them online.

EMS log

Tue Apr 09 11:49:00  1000 [node-nacl1-03: monitor: monitor.globalStatus.critical:EMERGENCY]: Disk shelf fault.
Tue Apr 09 11:49:06  1000 [node-nacl1-03: statd: monitor.shelf.fault:alert]: Critical fault reported on disk storage shelf attached to channel 0x. Check fans, power supplies, disks, and temperature sensors.
Tue Apr 09 11:49:06  1000 [node-nacl1-03: statd: callhome.shlf.fault:error]: Call home for SHELF_FAULT

• system health alert show

::> system health alert show
               Node: node-nacl1-04
           Alert ID: CriticalPSUFruOffAlert
           Resource: FFXW231xxxxx
           Severity: Critical
    Indication Time: Sun Nov 09 16:57:16 2025
           Suppress: false
        Acknowledge: false
     Probable Cause: PSU1 is off. The nodes in this chassis are node-nacl1-06.
    Possible Effect: The system might switch off if the other redundant
                     power supply units (PSUs) become faulty.
Corrective Actions: 1. Check PSU1 and switch it on.
                     2. Refer to the Hardware specification guide for more information on the position of the power supply unit (PSU) and ways to check or replace it.
                    3. Contact support personnel if the alert persists.

STORAGE-FAULT section of AutoSupport

Enclosure Status: unrecoverable
Channel: 0x
Shelf: 10
Shelf Type: NS224NSM100
Module Type: NSM100

Power Supplies:
Element Status       Status Bytes  Status Descriptions
1: OK                01,00,00,20   RQSTED ON
2: CRITICAL          02,00,00,F1   DC FAIL, OFF, RQSTED ON, FAIL