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 3, “Parts listing, Type 8864,” on page 23 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.
System-error log message Action
CPU IERR detected, the system has been
restarted
Information only; if the message persists:
1. (Trained service technician only) Reseat the microprocessors.
2. Reseat the microprocessor VRMs, if present.
3. (Trained service technician only) Replace the microprocessor.
CPU IERR, the CPU has been disabled Information only; if the message persists:
1. (Trained service technician only) Reseat the microprocessors.
2. Reseat the microprocessor VRMs, if present.
3. (Trained service technician only) Replace the microprocessor.
CPU non-critical over temperature warning
1. Make sure that the fans have good airflow and are not
obstructed.
2. (Trained service technician only) Reseat the microprocessor
heat sink.
CPU non-recoverable over temperature fault
1. Make sure that the fans have good airflow and are not
obstructed.
2. (Trained service technician only) Reseat the microprocessor
heat sink.
CPU mismatch: CPU unsupported by VRM.
CPU nn, where nn is the CPU number.
Replace the 10.1 VRM with a 10.2 VRM.
CPU removal detected Informational only; if the message persists:
1. (Trained service technician only) Reseat the microprocessors.
2. Reseat the microprocessor VRMs, if present.
CPU X Over Temperature
1. Check all fans and remove any obstacles from the path of the
airflow.
2. Make sure that the room temperature is within the
recommended range.
3. Make sure that the microprocessor heat sinks are correctly
seated.
Ethernet Data Rate modified from <value1> to
<value2> by user <USERID>
Information only
Ethernet Duplex setting modified from <value1>
to <value1> by user <USERID>
Information only
Ethernet interface <value> by user <USERID> Information only
Ethernet locally administered MAC address
modified from x:x:x:x:x:x
Information only
Ethernet MTU setting modified from x to y by
user <USERID>
Information only
Fan X Failure (X of 1-8)
1. Make sure that nothing is blocking the fan.
2. Check the physical connection and make sure that the fan is
correctly seated.
3. Replace fan X.
134 IBM System x3850 Type 8864: Problem Determination and Service Guide
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