Troubleshooting and Tips
14.2Front or Rear Identify/Fault LED Blinks Amber
If the front or rear identify/fault indicator blinks amber (see section “Operating and Indicator Elements of the Basic Unit” on page 50) one of the malfunctions described below may have occurred in the system:
One of the power supply units fails
The PSU status LED is unlit and/or the PSU fan failure LED blinks green if there is an error in the corresponding power supply unit, e.g. (see also figure “Power supply unit: LEDs” on page 132):
–General failure (alert or fan #1 shutdown)
–Overtemperature (any of the fans are not working properly in the correspon- ding unit)
–Overcurrent
–Over- or undervoltage
–The PSU is reaching the end of its life or is operating in an environment which exceeds the specified limits.
ÊCheck the PSU status and/or fan failure LEDs to identify the defective unit and exchange it (see section “Replacing a Power Supply Unit” on page 133).
One of the fans in the rear fan modules has failed
Even though the system can continue operating without one of the fans in the rear fan modules, you should:
ÊExchange the defective front fan module within a reasonable amount of time (see section “Replacing the Fan Unit” on page 141 and section “Replacing a Fan in the Unit” on page 143).
Switch blade fails
The failure LED of the switch blade lights up if there is a general error there.
ÊCheck the switch blade failure LEDs to identify the defective unit.
ÊIf the switch blade is still indicated as defective, exchange it (see section “Installing an I/O Blade” on page 96).
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