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 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)
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 110.
Redundancy Cooling Zone 1 has been
reduced.
Error Redundancy has been lost
and is insufficient to
continue operation.
1. Make sure that the
connectors on fans 1
and 2 are not
damaged.
2. Make sure that the fan
1 and 2 connectors on
the system board are
not damaged.
3. Make sure that the
fans are correctly
installed.
4. Reseat the fans.
5. Replace the fans.
Sensor RAID Error has transitioned to
critical from a less severe state.
Error A sensor has changed to
Critical state from a less
severe state.
1. Check the hard disk
drive amber status
LEDs to identify the
failed hard disk drive
or check the RAID
controller system
management software
event logs.
2. Reseat the hard disk
drive for which the
status LED is lit.
3. Replace the defective
hard disk drive.
60 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide
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