Status
System operating status:
Green—Normal system function.
Amber—Critical alarm indicating one or more of the following:
Major failure of a hardware or software component.
Over-temperature condition.
Power voltage outside the tolerance range.
https://www.cisco.com/c/en/us/td/docs/security/asa/hw/maintenance/5506xguide/b_Install_Guide_5506/b_Install_Guide_5506_chapter_01.html#concept_9EB479BF65B64360A7BF8DD21F3DD6C9