Controller Fan Servicing Notes; Troubleshooting Controller Fan Problems - IBM F10 Service Manual

Controller Fan Servicing Notes

You can hot swap the controller fan FRU (replace it while the controller module is
turned on and running), as long as you complete the exchange within 15
minutes. The time limit only applies to the total time that the fan FRU is out of the
chassis. The time begins when you remove the failed FRU and ends when you
re-seat the new one. This does not include the time it takes you to perform this
entire procedure (for example, checking LEDs).
Both fans failing simultaneously in the controller fan FRU is unlikely. Such a failure
would cause either one or both controllers to overheat. Under these circumstances,
the amber controller LED on the front cover may turn on. Shut down the controller
module immediately and let the unit cool to room temperature. Replace the
controller fan (see "Replacing a Failed Controller Fan" on page 106) and turn on the
power. Check the controller fault LED. It should remain off. If not, replace the
controller (see "Replacing a Failed Controller" on page 93).

Troubleshooting Controller Fan Problems

Symptom: Fan LED (front cover) is on or the host software reported a controller
fan problem.
1. Possible Cause: Power supply fan FRU is missing or unplugged.
2. Possible Cause: Power supply fan FRU failed.
3. Possible Cause: Controller fan FRU is missing or unplugged.
4. Possible Cause: Controller fan FRU failed.
5. Possible Cause: Circuitry failed or Power LED burned out on controller fan FRU.
Symptom: Controller and Fan Fault LEDs (front cover) are on.
1. Possible Cause: Both a controller and the controller fan failed.
a. Make sure the power supply fan FRU is plugged in correctly.
b. Check the LEDs on the power supply fan FRU. The power LED should be
on and the Fault LED should be off. If so, go to Possible Cause 3. If the
power LED is off or the Fault LED is on, go to Possible Cause 2.
a. Replace the power supply fan FRU using the instructions on "Replacing a
Failed Power Supply Fan" on page 109.
a. Make sure controller fan FRU is plugged in correctly.
b. If Power LED remains off, it indicates a failed controller fan FRU. Go to
Possible Cause 4.
a. Check the Fault LED on power supply fan FRU. If the Fault LED is off,
replace the controller fan FRU using the instructions on "Replacing a Failed
Controller Fan" on page 106. If the Fault LED is on, replace the power
supply fan FRU using the instructions on "Replacing a Failed Power Supply
Fan" on page 109.
a. Replace the controller fan FRU using the instructions on "Replacing a Failed
Controller Fan" on page 106.
a. Check both controller FRUs for fault LEDs, then replace the failed controller
FRU using the instructions on "Replacing a Failed Controller" on page 93.
b. After replacing the failed controller, check the LEDs on the front cover. If the
Fan LED is still on, replace the controller fan FRU using the instructions on
"Replacing a Failed Controller Fan" on page 106.
Chapter 5. Cooling System
105