Dell PowerVault TL4000 - Manual (Page 204)

Table 8-3. Warning events (continued)
DB External cooling fan error (fan motion
stopped).
The subcode indicates which drive sled
fan is affected
Subcode 01: drive sled #1(bottom)
Subcode 02: drive sled #2
Refer to “Isolating Drive Sled Problems” on page 7-9.
DC I 2 C Bus Failure
Refer to “Isolating a Power Supply Problem” on page 7-7.
DD Power Supply x fan failed,
Redundancy might be at risk
The subcode indicates which power
supply fan is affected
Subcode 01: 1st PS fan from bottom
Subcode 02: 2nd PS fan from bottom
DF Power Good signal that is changed from
2 to 1 Power Supplies
F6 No drive installed. A drive was never
installed.
Install at least one drive.
8-14 Dell PowerVault TL2000 Tape Library and TL4000 Tape Library User's Guide