Fujitsu PRIMERGY BX920 S3 Upgrade And Maintenance Manual page 48

Basic hardware procedures
– Global Error events that need to be resolved by maintenance personnel
– Customer Self Service (CSS) error events that may be resolved by
operating personnel
Global Error and CSS LEDs indicate, if the defective component is a customer
replaceable unit or if maintenance personnel needs to be dispatched to replace
the part.
I
The indicators also light up in standby mode and after a server blade
restart due to a power failure.
48 Upgrade and Maintenance Manual
BX920 S3