Step 7 Verify that all fans are operating. You should hear the fans at system start.
What to do next
If the system is still detecting a fan assembly failure, check for details using the Cisco IOS commands, save
the logs, and contact the Cisco TAC for assistance.
Useful Cisco IOS Commands - Fan Tray Assembly
You may use the following Cisco IOS commands in the priviledged EXEC mode, to diagnose fan tray problems.
• To turn the blue beacons on or off
Switch# hw-module beacon fan-tray on
Switch# hw-module beacon fan-tray off
• To display fan tray speeds
Switch# configure terminal
Switch(config)# service internal
Switch(config)# end
Switch# test platform hardware chassis fantray {nebs-mode | service-mode | write }
• To display fan tray status
Switch# show environment status
• To manually enter the NEBS mode
Switch# configure terminal
Switch(config)# service internal
Switch(config)# end
Switch# test platform hardware chassis fantray nebs-mode on
Enter the test platform hardware chassis fantray nebs-mode off command to turn the NEBS mode
off.
Troubleshooting High Temperature Alarms
A dirty air filter may cause overheating of the switch. Multiple board temperature sensors trigger alarm in
case of overheating caused by dirty filter.
Inspect the air filter if the high temperature alarm goes off.
Cleaning and Replacing Air Filters
The air filter removes dust from the room air drawn into the switch by the cooling fans. Once a month (or
more often in industry environments), you should examine the air filter. If the filter appears dirty, you can
either vacuum or replace it. If the filter appears worn or torn, dispose of it in a responsible manner and install
a replacement air filter.
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
110
Troubleshooting
Useful Cisco IOS Commands - Fan Tray Assembly
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