Please follow the below steps

  1. Download and extract the zip file, it has a "cpldtest" binary  
  2. Upload the cpldtest file to the problematic unit (/var/tmp directory)
  3. Login to the unit, and execute the binary as below (this will basically read the fan speed in hex)

             cd /var/tmp 
             chmod a+x cpldtest
             sudo ./cpldtest -a 0x81 -r


<for example, below, if the value turns out to be 0 it would mean that the fans are not functional>

[admin@versa-flexvnf: ~] $ sudo ./cpldtest -a 0x81 -r
Read CPLD register 0x81: 0x65
[admin@versa-flexvnf: ~] $