There is not an official hardware diagnostic that you can download and run on the switch. Here are some options you can use to help monitor the switch. - console# show system, This will show you the current status of fans, power supplies, and temperatures. This can be used to help look for some faulty components. This can also be seen in the GUI under System>General>Health. - console# show logging, Any time an error occurs, including hardware errors, a log message will be stored. This can also be seen in the GUI under System>Logs. If the logging is corrupt, or has aged out, then it will not show you the logs you need. And if everything has returned to normal, then the show system command may not be helpful right now. To help monitor the switches, It may be beneficial to setup a syslog server. Page 369 of the user guide has some information on how to configure a syslog server. [URL] 
Hello everyone :)I'm trying to run hardware test on DELL switch n2048 by CLI and WEB, but i can't find option like this.Search in google without result. Have the last firmware. Have a problem with this switch but can't understand it is configuration or hardware Please help me.Thank a lot.
Hardware Diagnostics