•Interval 3 — If the calculated value of the PWM duty cycle is less than or equal to 100%, the FC firmware will send a signal to the fan to operate at the set duty cycle.
•Interval 4 — If the calculated value of the PWM duty cycle is higher than 100%, the FC firmware will send a signal to the fan to operate at 100% duty cycle and trigger sled throttling.
•Interval 5 — If the calculated value of the PWM duty cycle is less than or equal to 100%, the FC firmware will send a signal to the fan to operate at the set duty cycle.
•Sixth interval — If the calculated value of the PWM duty cycle is still higher than 100% again, the FC firmware will send a signal to the fan to operate at 100% duty cycle and trigger sled throttling for 1 hour.
To troubleshoot the enclosure fan modules:
1Locate the faulty fan module in the back of the enclosure.
2Each fan module has indicators that identify a faulty fan. See Figure
3Remove the fan module. See "Removing a Fan Module" on page 207.
4Examine the blades for debris. If debris is present, carefully remove it.
5Reseat the fan module. See "Installing a Fan Module" on page 208.
6If none of the fan indicators show a fault LED and the blade do not power on, log into the BMC web interface and check for status messages.
7If the problem is not resolved, install a new fan.
8If the new fan does not operate, see "Getting Help" on page 289.
Troubleshooting
