H3C Technologies H3C S12500 Series Switches - Manual (Page 98)

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Fan failure
Table 28 Fan LED description
LED Status Description
RUN
Off The fan tray has failed.
Flashing The fan tray is operating properly.
ALM
Off The fan tray is in a normal state.
Flashing The fan tray is faulty.
Steady on The fan tray is faulty.
When the RUN LED is off or the ALM LED is on or flashing, the fan has failed.
To troubleshoot the fan:
1. If both LEDs are off, verify that the power supply is operating properly. For more information, see
"
Power supply system failure ."
2. Check whether the air intake and exhaust vents of the chassis are blocked. If they are blocked,
clean them to keep the air flow smooth.
3. Verify that the fan tray is fully seated. You can unplug the fan tray, plug it again, and check
whether the fan LEDs are normal.
4. If you have a spare fan tray, plug it into the slot, and verify that the spare fan tray can operate
properly. If yes, the old fan tray fails.
5. If the failure still exists, contact the local agents or technical support engineers.
MPU failure
Figure 64 MPU LEDs
(1) CF card status LED (CFS) (2) Switching fabric module LED (SFC) (3) LPU status LED (LC)
(4) Fan status LED (FAN) (5) Power status LED (PWR) (6) MPU status LED (ACT)
(7) MPU status LED (RUN) (8) Network management port LED
(LINK) (9) Network management port LED
(ACT)
When the MPU is operating properly, the RUN LED (callout 7 in Figure 64 ) flashes in green. When the
RUN LED is off, steady on, or flashes in red, the MPU has failed.