Cisco 6006 and FAN error

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Oct 8th, 2008
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I am running a Cisco 6006 with msfc module. I get these error messages "%SYS-2-FAN_NFAIL:Fan 1 failed" than "%SYS-2-FAN_NOK:Fan 1 okay". How this error affects my switch? And shall I change fan tray?

Tanks in advance!


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guruprasadr Wed, 10/08/2008 - 23:00
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HI Sfanayei, [Pls RATE if HELPS]

1. %SYS-2-FAN_NFAIL: Fan [dec] failed

This message indicates that a fan tray has failed.

Recommended Action: Replace the fan tray.

2. %SYS-2-FAN_NOK: Fan [dec] okay

This message indicates that the chassis fan tray was plugged back in or returned to a proper state.

Recommended Action: No action is necessary. This message is provided for information only.

Hope I am informative.


Best Regards,

Guru Prasad R

sfanayei Wed, 10/08/2008 - 23:07
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Tanks for your reply. I know what those massages means, But i get those massages at same time. The switch changs between to massages. Is fan ok or not?

Tanks again.

guruprasadr Wed, 10/08/2008 - 23:20
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HI sfanayei, [Pls RATE if HELPS]

Take a down-time to Un-plug & Re-plug the FAN Tray and Ensure the FAN Tray is exactly placed.

Wait for the next re-occurance of ERROR before changing the FAN Tray itself. As the FAN Services are not CRITICAL.

Hope I am Informative.


Best Regards,

Guru Prasad R

glen.grant Thu, 10/09/2008 - 03:22
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More than likely the fan tray is on its way out , we see this all the time on our older Cat 4006's where its says fan failed then fan ok . The tray is going . Its not the whole tray either, whatever sensor they are using is sensitive enough to know when a single fan in the whole fan tray is gone and it will give you those messages . You almost always can tell which fan it is in the tray too because it will not spin nearly as freely as the others in the tray . That being said I would replace it . Fan services are CRITICAL if you have it in a closet where the air is not conditioned .

sfanayei Thu, 10/09/2008 - 03:44
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Hi tanks for your reply.

Is it hot plug or I have to turn off for the system to check out?


guruprasadr Thu, 10/09/2008 - 03:49
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HI Sfanayei, [Pls RATE all Informative POST]

They are hot plug / play as per 4000 Series.


Never operate the system for an extended period if the fan assembly is removed or if it is not functioning properly. An overtemperature condition can cause severe equipment damage.

When removing the fan tray, keep your hands and fingers away from the spinning fan blades. Let the fan blades completely stop before you remove the fan tray.

Grasp the fan assembly with both hands and pull it outward; wiggle it, if necessary, to unseat it from the backplane. Slide the fan assembly completely out of the chassis and place it in a safe place.

Pls RATE all Informative POST.

Best Regards,

Guru Prasad R


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