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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the ″Parts Listing″ section in the Hardware Maintenance Manual to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Sensor PS n Therm Fault has
transitioned to critical from a less
severe state.
(n = power supply number)
Error A sensor has changed to
Critical state from a less
severe state.
1. Make sure that there are no
obstructions, such as bundled
cables, to the airflow from the
power-supply fan.
2. Replace power supply n.
(n = power supply number)
Sensor PS n 12 V OV Fault has
transitioned to non-recoverable.
(n = power supply number)
Error A sensor has changed to
Nonrecoverable state.
1. Check the power-supply LED.
2. Remove the power supplies.
3. Replace power supply n.
4. (Trained service technician
only) Replace the system
board.
(n = power supply number)
Sensor PS n 12 V UV Fault has
transitioned to non-recoverable.
Error A sensor has changed to
Nonrecoverable state.
1. Check the power-supply LED.
2. Remove the power supplies.
3. Replace power supply n.
4. (Trained service technician
only) Replace the system
board.
(n = power supply number)
Sensor PS n 12 V OC Fault has
transitioned to non-recoverable.
(n = power supply number)
Error A sensor has changed to
Nonrecoverable state.
1. Check the power-supply LED.
2. Remove the power supplies.
3. Replace power supply n.
4. (Trained service technician
only) Replace the system
board.
(n = power supply number)
Sensor PS n VCO Fault has
transitioned to non-recoverable.
(n = power supply number)
Error A sensor has changed to
Nonrecoverable state.
1. Check the power-supply LED.
2. Replace the failing power
supply.
(n = power supply number)
Redundancy Power Unit has been
reduced.
Error Redundancy has been lost
and is insufficient to continue
operation.
1. Check the LEDs for both
power supplies.
2. Follow the actions in
“Power-supply LEDs” on page
24.
Chapter 8. Troubleshooting 163