Changing The Status Of A Psu That Is Marked As Faulty - Sun Microsystems SPARC Enterprise T5120 Product Notes

If the External I/O Expansion Unit is in use by the system when AC power
interruption occurs, the server's service processor may change the PSU fault status
to faulty and light the amber FAULT LED on the PSU. Once a PSU is marked
faulty, the fault status will persist through power cycles so the fault status must be
manually cleared. See below for the workaround to clear the PSU fault status.

Changing the Status of a PSU That Is Marked As Faulty

If a server's service processor detects that a PSU is off, the status of the PSU changes
to faulty. The faulty status can persist after the PSU is turned back on.
To clear the fault status of a PSU:
1. Ensure that the hardware problem is cleared and the green OK LED is on.
2. Ensure that the domain is on and the External I/O Expansion Unit can be
accessed by the service processor.
The External I/O Expansion Unit should be visible under this command:
-> show /SYS
3. Issue the following command:
-> set clear_fault_action=true /SYS/IOX@nnnn/PSx
Where nnnn is the External I/O Expansion Unit and x is the instance of the power
supply.
External I/O Expansion Unit Product Notes 3