IBM 88861TU Installation And User Manual page 34

Fan modules
The BladeCenter S chassis comes with four installed hot-swap fan modules.
The fan modules (sometimes called fan packs) are designed to provide cooling
airflow to the blade servers and I/O modules. Each fan module contains two fans.
Indicators and controls
Each fan module has a single LED:
Error
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BladeCenter S Type 7779/8886: Installation and User's Guide
connected to the same power input voltage (either 110 V ac or 220 V
ac). Do not mix power input voltages.
2. Unplug the AC power cord from the power module and plug it in
again.
3. Reseat the power supply.
4. Swap the AC power cord with a power cord that is known to be
working.
5. Move the power module to another power module bay in the
BladeCenter S chassis.
Fan error LED
Lit (amber). One of the fans in the fan module has failed.
Note: If one of the fans in the fan module fails, the other fan will begin
operating at full speed.