Troubleshoot the Power Supply Fans

Two LEDs on each power supply faceplate report power supply status: a green LED labeled OK and a red LED labeled FAIL. In addition, a fail condition triggers the red alarm LED on the craft interface.

Issue the following CLI command to check the status of the power supplies and their fans. As shown in the sample output, the value OK in the Status column indicates that the power supply is operating normally:

user@host> show chassis environment

    Class Item                   Status     Measurement

    Power Power Supply A         OK 

          Power Supply B         OK 

For further description of the output from the command, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.