Confirm Controller Access Failure by running extended diagnostics
. The following output will confirm controller failure:
Switch1# show diagnostics
Last Test Date: Dec-01-2016 I2C environment: Fan Read Failure
Fan module test: controller access failure
Last Test Version: 6.4
Summary: Diagnostics Fail
If the above steps show diagnostics to have passed, or if diagnostics cannot be performed, please contact Extreme Networks GTAC for debug level troubleshooting.