Jet or fast-moving air noises

Use the information in this section to troubleshoot jet or fast-moving air noises from a power supply or fan module.


  1. Check the event logs for events that are related to high temperatures or a failed fan module. These events can cause the fan speed to increase to make sure that the chassis is cooled properly. In addition, you might notice an increased noise from the power-supply fans.
  2. Check the chassis air filters for dust accumulation and replace if necessary (see Replacing the filter media for more information).
  3. If all of the chassis fans are running at full speed, the chassis may not be communicating with the CMM. Check the CMM status LEDs (see CMM controls and indicators).