HP Surestore Disk Array 12h - And FC60 Service Manual page 270

If the air temperature inside the rack is hot enough to cause the power
C
AUTION
supplies to shutdown (>= 70º C (158º F), there is a serious problem in the
rack. Remove all panels from the rack immediately to help cool the controller
enclosure. Take whatever action is necessary to alleviate the over-temperature
problem (such as shutting down the power or using external fans to cool the
area).
Controller Enclosure Troubleshooting
270