System-error LED
When it is lit, the system-error LED indicates that a system-board error has occurred.
Figure 1. SAN Volume Controller
2145-DH8 operator-information
panel

This amber LED lights up if the hardware detects an unrecoverable error that requires a new field-replaceable unit (FRU).
Note: See MAP 5800: Light path to help you isolate the faulty
FRU.