Table 6. IMM error messages (continued)
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 4, “Parts listing, System x3550 M3 Types 4254 and 7944,” on page 159 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 Fan 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 VT Fault has transitioned to
non-recoverable.
Error A sensor has changed to
Nonrecoverable state.
1. Check the
power-supply LEDs.
2. Follow the actions in
“Power-supply LEDs”
on page 110 and
“Power problems” on
page 96.
3. Replace the failing
power supply.
4. (Trained service
technician only)
Replace the system
board.
Sensor Pwr Rail A Fault has transitioned
to non-recoverable.
Error A sensor has changed to
Nonrecoverable state.
1. Turn off the server and
disconnect it from
power.
2. Remove the optical
drive, fans, hard disk
drives, and hard disk
drive backplane.
3. Reinstall each device,
one at a time, starting
the server each time to
isolate the failing
device.
4. Replace the failing
device.
5. (Trained service
technician only)
Replace the system
board.
Chapter 3. Diagnostics 57
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