Avago Technologies 3ware 9650SE-12ML (Channel) - Manual (Page 314)

Troubleshooting
302 3ware SAS/SATA RAID Software User Guide, Version 9.5.1
The enclosure fan is not functioning normally and may be blocked or
defective.
Action
Check that the fan or fans are not blocked. If a fan appears defective, replace
it as soon as possible.
For information on replacing a fan, see your enclosure documentation or
contact your enclosure manufacturer.
8002 Enclosure fan removed
Event Type
Warning.
Cause
Applies only to the 9690SA controller.
A fan has either been removed or has become unplugged.
Action
Replace or reseat fan and make sure it is operational. An insufficient number
of operating fans may lead to overheating of the components in the enclosure.
8003 Enclosure fan added
Event Type
Information.
Cause
Applies only to the 9690SA controller.
A fan has been added to the enclosure or an existing fan has been plugged in.
Action
None required.
8004 Enclosure fan unknown
Event Type
Warning.