I have WS-C4506-E switch and currently getting continuous logs of PSU fan failure and fan OK simultaneously (in around ever 10 seconds). Physically fan is working. Please suggest any possible solution on this.
Thanks in advance
ask for a a maintenance window power off the switch and remove and reseat the FAN module(s).
This might solve your issue.
If the FAN are working correctly the switch can work without any issues (with many useless log messages I understand this point)
Hope to help
as I read this, it's not the chassis fan tray, it is one of the power supply fans. What I have typically seen for this condition is to RMA the power supply. The other thing that I have seen, although only once or twice, is a flaky line feed and you have to call an electrician. But most often this message has been caused by a power supply going bad. Assuming you have two supplies, the replacement would be transparent as long as you are configured for redundant mode and not combined mode.