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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 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.
LED Description Action
OVER
SPEC
The server was shut down due to a
power-supply overload condition on one
of the power channels. The power
supplies are using more power than the
maximum rating.
1. If any of the 12v power channel error LEDs (A, B, C, D, E,
or AUX) on the system board are lit also, see “Solving
power problems” on page 143. (See “Power-supply LEDs”
on page 50 for the location of the power channel error
LEDs.)
2. Check the power supply LEDs for an error indication (AC
LED and DC LED are not both lit, or the power-supply error
LED is lit). Swap power supplies 1 and 2 with each other.
v If the error follows the power supply, replace the failed
power supply.
v If the error remains with the power bay, (trained service
technician only) replace the system board.
3. Remove optional devices from the server.
LOG An error message has been written to
the system-event log
Check the IMM system event log and the system-error log for
information about the error. Replace any components that are
identified in the error logs.
LINK Reserved.
PS A power supply has failed.
1. Check the power supply LEDs for an error indication (AC
LED and DC LED are not both lit). See “Power-supply
LEDs” on page 50 for more information.
2. Make sure that the failing power supply is correctly seated.
3. Replace the failed power supply.
PCI An error has occurred on a PCI bus or
on the system board. An additional LED
will be lit next to a failing PCI slot.
1. Check the LEDs on the PCI slots to identify the component
that is causing the error.
2. Check the system-event log for information about the error.
3. If you cannot isolate the failing adapter through the LEDs
and the information in the system-event log, remove one
adapter at a time from the failing PCI bus, and restart the
server after each adapter is removed.
4. Call for service.
SP
™
The service processor (the IMM) has
failed.
1. Remove power from the server; then, reconnect the server
to power and restart the server.
2. Update the firmware on the IMM.
3. Call for service
FAN A fan has failed, is operating too slowly,
or has been removed. The TEMP LED
might also be lit.
Replace the failing fan, which is indicated by a lit LED near the
fan connector on the system board.
TEMP The system temperature has exceeded
a threshold level. A failing fan can
cause the TEMP LED to be lit.
1. Check the error log to identify where the over-temperature
condition was measured. If a fan has failed, replace it.
2. Make sure that the room temperature is not too high. See
Table 1 on page 19 for temperature information.
3. Make sure that the air vents are not blocked.
4. Call for service.
48 ThinkServer RD220 Types 3729, 3779, 3797, and 3798: Hardware Maintenance Manual