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Fans failed error on x440-24t even if fans are not rotating on purpose.

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TitleFans failed error on x440-24t even if fans are not rotating on purpose.
Symptoms
X440-24t-10G[34].1 # show fans 

FanTray information:
 State:                  Operational
 NumFan:                 2
 Fan-1:                  Failed at 0 RPM
 Fan-2:                  Failed at 0 RPM
X440-24t-10G[34].2 # show temperature 
Field Replaceable Units               Temp (C)   Status   Min  Normal   Max
---------------------------------------------------------------------------
Switch         : X440-24t-10G           28.50    Normal   -10    0-48  55
X440-24t-10G[34].3 #
Environment
  • x440-24t
  • EXOS 16.1
Cause
 Fan speed of “0” RPM is expected in X440-24t switches of hardware revision greater than or equal to 5.0. Fan will rotate only when the temperature exceeds normal value “0-48”. However, EXOS 16.1 contains software defect xos0066179 because of which fan status is marked as “Failed” when RPM is “0”.

 
Resolution
Upgrade to EXOS where xos0066179 is fixed.
If temperature of the switch is higher then +48° C and "show fans" says that fans are failed then please contact the GTAC for further assitance.
 
Additional notes
For other x440 platforms please refer to KB article Summit X440 Fan Failure

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