I have a 3COM 3870 switch that is randomly getting a Fan Failure alert. When I took the cover off, all the fans appear to be working fine - even when it is faulting. None are grinding or making any noise. The switch will randomly stop all the fans, show the fan failure alert for a minute or so, then start them back up and the failure message goes away.
Should I replace all 4 fans? Is it really a fan problem, or something wrong with the logic board? Unfortunately it is no longer under warranty since HP bought out 3COM. The switch never runs hot and the fan fault does not appear to affect the function of the switch - if replacing the fans does not help, is it safe to run the switch?