Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 297)

Error and Notification Messages
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Action
If due to a poor connection, the repair will require specialized skills. Contact
your enclosure manufacturer for more information.
8027 Enclosure temp critical
Event Type
Error.
Cause
Applies to 9750 and 9690SA controllers.
The temperature in the enclosure is dangerously out of the recommended
operating range.
Action
Take immediate steps to correct the temperature problem.
Take steps to lower the enclosure temperature, such as adding fans, clearing
enclosure openings of blockages, and increased ventilation of the operating
environment
Continued operation of the enclosure at high temperatures may lead to data
loss and operational failure.
See your enclosure documentation or contact your enclosure manufacturer to
make sure you are following proper operating procedures.
8028 Enclosure temp unknown
Event Type
Warning.
Cause
Applies to 9750 and 9690SA controllers.
The enclosure is reporting that it is unable to determine the temperature of the
unit. This may be due to a failed or missing sensor.