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    Troubleshooting the Cooling System in an EX9208 Switch

    Problem

    The fans in the fan tray are not functioning normally.

    Cause

    Solution

    Follow these guidelines to troubleshoot the fans:

    • Check the fan LEDs and alarm LEDs on the craft interface.

      If the major alarm LED on the craft interface lights, use the CLI to get information about the source of an alarm condition:

      user@switch> show chassis alarms

      If the CLI output lists only one fan failure, and the other fans are functioning normally, the fan is most likely faulty and you must replace the fan tray.

    • Place your hand near the exhaust vents at the side of the chassis to determine whether the fans are pushing air out of the chassis.
    • If a fan tray is removed, both, a MINOR alarm and a MAJOR alarm, occur.
    • The following conditions automatically cause the fans to run at full speed and also trigger the indicated alarm:
      • A fan fails (MAJOR alarm).
      • The switch temperature exceeds the temperature warm threshold (MINOR alarm).
      • The temperature of the switch exceeds the temperature hot threshold (MAJOR alarm and automatic shutdown of the power supplies).

    Published: 2013-04-02