Juniper T640 Hardware Manual page 237

Table 42: T640 Cooling System Alarm Messages (continued)
Component Alarm Type
Temperature Red
sensors
Yellow
Solution
Copyright © 2013, Juniper Networks, Inc.
LCD Message
Temperature Hot
Sensor Failure
Temperature Warm
To troubleshoot the cooling system:
Place your hand near the exhaust vents at the rear of the chassis to determine whether
1.
the fans are pushing air out of the chassis.
If the red alarm LED on the craft interface lights, look at the craft interface display to
2.
find the source of the problem. The number of alarm conditions, as well as the source
of each alarm, appears on the screen.
If the craft interface display lists only one fan failure and the other fans are functioning
3.
normally, the fan is probably faulty and you need to replace the fan tray.
Use the CLI to check the status of the fans. For example, you can issue the following
4.
command to get information about the source of an alarm condition:
user@host> show chassis alarms
For information about the alarms, see
Chapter 16: Troubleshooting T640 Router Hardware Components
CLI Message Alarm Condition
The chassis
Temperature Hot
temperature
exceeded the hot
temperature
threshold. If this
condition persists,
the router shuts
down.
Temperature sensor A temperature
sensor failed.
failure
The chassis
Temperature Warm
temperature
exceeded the warm
temperature
threshold.
Table 42 on page
Solution
Verify that the
room
temperature is
within
acceptable
limits.
Verify that
there is
sufficient air
flow.
Verify that the
cooling system
in the chassis is
operating
properly.
Contact JTAC.
Verify that the
room
temperature is
within
acceptable
limits.
Verify that
there is
sufficient air
flow.
Verify that the
cooling system
in the chassis is
operating
properly.
204.
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