Fan Assembly - Compaq RAID Array 4100 User Manual

The lower amber LED is the Bypass Port LED, which indicates that the
associated port is in bypass mode. Ports that do not detect valid FC-AL links
are placed in bypass mode by the hub. The amber LED is turned on for each
port in the bypass mode.
Figure 4-9. Bypass mode LED on the Storage Hub 12

Fan Assembly

If the fan assembly LED is amber, the replace the fan assembly as soon as
possible.
CAUTION: Failure to follow the instructions in this section can result in
component damage.
Troubleshooting 4-7