Fault Description
Fans on a router run at full speed and create loud noises. The STATUS indicator on the fan module is fast blinking red.
Possible Causes
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The fan module is not installed properly in the fan slot.
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One or more fans stop running because the blades are blocked.
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The fan module is not running the latest software version.
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The fan module is faulty.
Troubleshooting Procedure
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Reinstall the fan module to make sure that it is securely connected to the backplane, and then fasten the captive screws on the fan module panel.
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If there are obstacles blocking fan blades, remove the fan module, clear the fans, and install the fan module in the chassis.

