User Manual

Troubleshoot the Cooling System
Troubleshoot the Power Supply Fans
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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.