49
Maintenance and troubleshooting
Power module failure
Look at the PWR1 or PWR2 LED of the switch to identify a power module failure. For more information
about the PWR1 and PWR2 LEDs on the front panel of the switch, see
.
If the power module system is correctly operating, the power module status LEDs are steady green. If the
LEDs behave in any other way, verify the following items:
•
The switch power cord is properly connected.
•
The power source meets the requirement.
•
The operating temperature of the switch is in the normal range and the power module has good
ventilation.
If the problem persists, contact H3C for help.
To replace a hot swappable power module, see "
Installing/removing a power module
Fan failure
CAUTION:
For the S5120-28SC-HI and S5120-52SC-HI switches, you can replace the fan tray without powering off
the switch. To prevent overheating, replace the failed fan tray within 2 minutes.
You can look at the system status LED and the seven-segment LED of an S5120-HI switch to identify a fan
failure. If both LEDs are behaving as described in
, a fan failure occurs.
Table 8
LED behaviors that identify a fan failure
LED Mark
State
System status LED
SYS
Steady red
Seven-segment LED
Unit
The LED displays a flashing
F
character.
The S5120-34C-HI and S5120-58C-HI switches use fixed fan trays. If a fan failure occurs, promptly
contact H3C for help.
The S5120-28SC-HI and S5120-52SC-HI switches use hot swappable fan trays. When the fan tray fails,
use the
display
fan
command to verify that the expected airflow direction is the same as the airflow
direction of the fan tray. If not, use the
fan prefer-direction
command to modify the configuration.
If the problem still exists, the fan tray might have failed. You can replace the fan tray as described in
"
Installing/removing a fan tray
