Bull NovaScale 4020, User Manual, Page: 149 / 173

Hot-swapping System Components 133
Determining Fan Failure
Each fan uses an amber LED to indicate the failed fan. The LED for each fan illuminates only
when a fan fails. When an LED illuminates the associated fan should be replaced. To view the
LEDs:
1. See the warnings and cautions under Removing and Installing the Top Cover on page 126.
2. Follow the instructions under Removing the Top Cover .
3. Locate the fan bay. See Figure 52 for location information.
4. If a fan has failed, the LED for that fan will display an amber LED. See letter “A” in
Figure 59 for help in locating the LEDs.
5. To replace a failed fan, see Replacing a System Fan . If no fan has failed, follow the
instructions under Installing the Top Cover .
Replacing a System Fan
Refer to Figure 59 and use the instructions below to replace a hot-swap system fan:
1. See the warnings and cautions under Removing and Installing the Top Cover on page 126.
2. Follow the instructions under Removing the Top Cover .
3. Follow the instructions under Determining Fan Failure to identify the failed fan.
4. Place your fingers into the fan access points and squeeze your fingers together to release the
fan latch and remove the fan. See letter “B”
Figure 59 .
5. Insert the replacement fan into place. It will fit only one way into the opening and will
easily click into place.
6. Follow the instructions under Installing the Top Cover .
TP00318
A
B
A. Fan LEDs (two of six pointed out)
B. Access points
Figure 59. System Fan Location and Removal