En.02 critical condition-blower speed, En.03 unrecoverable condition-blower failure, En.04 unrecoverable condition-blower internal – HP 3000 Enterprise Virtual Array User Manual
Page 170: En.05 noncritical condition-blower missing

EMU Generated Condition Reports
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Enterprise Virtual Array 3000 User Guide
0.3.en.02 CRITICAL Condition
—
Blower Speed
A blower is operating at a speed that is significantly outside the EMU specified
range, possibly because of a bearing problem. This can cause the loss of cooling
and cause an element to fail. The error remains active until the problem is
corrected.
HP recommends replacing the blower as soon as possible.
To correct this problem, record all six characters of the condition report, then
contact your HP authorized service representative.
0.3.en.03 UNRECOVERABLE Condition
—
Blower Failure
A blower has stopped. The operational blower now operates at high speed and is a
single point of failure. This condition report remains active until the problem is
corrected.
To correct this problem, record all six characters of the condition report, then
contact your HP authorized service representative.
0.3.en.04 UNRECOVERABLE Condition
—
Blower Internal
A power supply reported an internal blower error that could affect enclosure
cooling and cause an element to fail. HP recommends correcting the problem
before the blower fails. This condition report remains active until the problem is
corrected.
To correct this problem, record all six characters of the condition report, then
contact your HP authorized service representative.
0.3.en.05 NONCRITICAL Condition
—
Blower Missing
A blower has been removed or is improperly installed. Even though the blower
flaps close to maintain the proper air flow, the reduced cooling capability can
cause overheating, causing an element to fail. This condition report remains active
until the problem is corrected.
To correct this problem, record all six characters of the condition report, then
contact your HP authorized service representative.