Fujitsu BS2000 SE Series Operating Manual page 13

CSS CSS indicator (yellow)
Lights up yellow when a prefailure event was detected which requires Customer Support to become
active (by way of precaution).
Flashes yellow when an error was detected which requires Customer Support to become active.
Does not light up when no critical event has occurred.
If the event is still acute after the Server Unit has been switched on/off, the indicator is activated after
the restart.
The indicator also lights up in standby mode.
If the indicator flashes or lights up yellow , call Customer Support.
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