Juniper Networks Technical Assistance Center; Troubleshooting The Mx960 Cooling System - Juniper MX960 Hardware Manual

Routing Engine LEDs—Four LEDs, labeled MASTER, HDD, ONLINE, and FAIL on each Routing Engine
faceplate indicate the status of the Routing Engine and hard disk drive.
Power supply LEDs—Two LEDs on each power supply faceplate indicate the status of that power supply.

Juniper Networks Technical Assistance Center

If you need assistance during troubleshooting, you can contact the Juniper Networks Technical Assistance
Center (JTAC) by using the Web or by telephone.
RELATED DOCUMENTATION

Troubleshooting the MX960 Cooling System | 656

Troubleshooting the MX960 DPCs | 657
Troubleshooting the MX960 FPCs | 659
Troubleshooting the MX960 PICs | 662
Troubleshooting the MX960 MPCs | 664
Troubleshooting the MX960 MICs | 662
Troubleshooting the MX960 Power System | 667
Troubleshooting the MX960 Cooling System
Problem
Description: The fans in a fan tray are not functioning normally.
Solution
Follow these guidelines to troubleshoot the fans:
Check the fan LEDs and alarm LEDs on the craft interface.
If the red alarm LED on the craft interface lights, use the CLI to get information about the source of an
alarm condition: user@host> show chassis alarms.
If the CLI output lists only one fan failure, and the other fans are functioning normally, the fan is most
likely faulty and you must replace the fan tray.
Place your hand near the exhaust vents at the side of the chassis to determine whether the fans are
pushing air out of the chassis.
656