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78 Operating Manual BX900 S1
Troubleshooting and tips
© cognitas. Gesellschft für Technik-Dokumentation mbH 2010 Pfad: C:\Programme\FCT\tim_app\tim_local\work\WALTER\OBJ_DOKU-4952-006.fm
7.2 Front or back error LED flashes orange
If the front or back ID/error LED is flashing orange (see section "Control and
display elements" on page 57), one of the following errors may have occurred:
One of the power supply units has failed
The status LED of the power supply unit is not lit and/or the error LED of the
power supply unit flashes green if, for example, one of the following errors has
occurred in the power supply unit (see also figure "Indicators on the hot-plug
power supply unit" on page 66):
– General failure (warning or shutdown due to fan no. 1)
– Temperature exceeded (one of the fans in the power supply unit is not
working properly)
– Overcurrent
– Overvoltage or undervoltage
– The power supply unit is reaching the end of its life or its ambient thresholds
are being exceeded.
Ê Check the status of the power supply unit and/or the fan-failure LEDs to
identify the defective module and replace it (see section "Replacing the
power supply unit" on page 135).
One of the fans in the fan module has failed
Although the system can still be used if one of the fans in the fan module fails,
you should:
Ê Replace the defective fan module as soon as possible (see section "Hot-plug
fan modules" on page 137 and section "Replacing a fan unit" on page 138).
A switch blade has failed
The error LED of the switch blade lights up when a general error occurs.
Ê Check the error LEDs of the switch blades to find out which blade has failed.
Ê If the switch blade is still being shown as defective, replace it (see section
"Installing a connection blade" on page 120).