Troubleshooting
Troubleshooting Using LED Indicators
Chapter 4
56
Green Green Off Red Flashing
Red
Fan 4 failure. BMC is reporting that both fan
rotors are turning more slowly that expected (or
stopped). Replace the fan, fan control board, or
system board.
Green Green Green Red Flashing
Red
CPU 0 turbofan failure. Replace CPU 0, the
CPU power module, or the system board.
Green Red Off Red Flashing
Red
Power supply 1 fault. Replace power supply 1,
the power supply interface board, or the system
board.
Green Red Green Red Flashing
Red
12V range error. Something is loading the 12V
source. This can be either power supply, the
power supply interface, the system board, or any
using circuit. Replace items (1 at a time) to
identify the cause.
Red Off Off Green Flashing
Red
Memory bank error. Verify that DIMMs are
correctly installed.
Red Green Off Off Flashing
Red
Memory mismatch fault. DIMMs of different
size are installed in a single quad. Replace
DIMMs as required.
Red Green Green Off Flashing
Red
Memory access fault. Check error messages in
the SEL. Reseat or replace DIMMs as required.
Red Green Green Green Flashing
Red
Memory error detected. Check error messages in
the SEL. Reseat or replace DIMMs as required.
Red Green Green Red Flashing
Red
Intake air overtemperature fault. Check for
blockages. Replace the system board.
Red Green Red Off Flashing
Red
BMC firmware error. Power down the server,
wait 20 seconds and resume operation. If the
problem continues, replace the system board.
Red Green Red Green Flashing
Red
MP firmware error. Power down the server, wait
20 seconds and resume operation. If the problem
continues, replace the management processor.
Red Red Off Green Flashing
Red
CPU 1 overtemperature fault. Check for
blockages. Replace CPU 1 or the system board.
Red Red Green Off Flashing
Red
CPU 0 overtemperature fault. Check for
blockage. Replace CPU 0 or the system board.
Red Red Green Green Flashing
Red
Either or both CPUs not detected. Check CPU
installation and replace CPU, power module, or
system board if necessary.
Table 4-3 Diagnostic LED Displays and Meanings (Continued)
Diag 1
LED
Diag 2
LED
Diag 3
LED
Diag 4
LED
System
LED
Description
