WLC 5520 - loud Voice

[Mostafa.Ragab]

Dears,

I installed two 5520 WLC's and they are making a very loud voice. I checked the the Fan, Temperature, and Power supply status and all was working fine.  But i noticed that the Fans RPM is very huge (From 16000 to 20000 RPM).

Now i just want to know is the very loud voice for the model is normal behavior and is the upper RPM rate is normal for 5520 controllers.

                                                              Thanks in advance

[Rasika Nayanajith]

What software version you running. Initial code of 5520/8540 had this problem.

Go with 8.2.131.0 if you are not with that code

http://www.cisco.com/c/en/us/td/docs/wireless/controller/release/notes/crn82mr2.html

CSCux93468

Anomalous fan speed and temp reading for Cisco 8540 WLC

HTH

Rasika

*** Pls rate all useful responses ***

[Mostafa.Ragab]

My SW version is 8.1.102.0. I will try to upgrade the SW version and will feedback with the results.

Thanks :)