Table 31: T4000 Temperature Alarms
Solution
Alarm Condition
CLI Message
Craft Interface LCD
Message
Alarm
Type
•
Place your hand near the exhaust vents
at the rear of the chassis to determine
whether the fans are pushing air out of
the chassis.
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.
The chassis
temperature
exceeded the
recommend hot
temperature
threshold. If this
condition persists,
the router shuts
down.
Temperature Hot
Temperature Hot
Red
Contact JTAC.
A temperature sensor
failed.
Temperature sensor
failure
Sensor Failure
•
Place your hand near the exhaust vents
at the rear of the chassis to determine
whether the fans are pushing air out of
the chassis.
•
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.
The chassis
temperature
exceeded the
recommended warm
temperature
threshold.
Temperature Warm
Temperature Warm
Yellow
Solution
To troubleshoot the cooling system:
1.
Check the red and yellow alarm LEDs on the craft interface.
2.
Find the source of the problem by looking at the craft interface display. 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
normally, the fan is probably faulty and you need to replace the fan tray.
3.
Use the
show chassis alarms
command to get information about the source of an
alarm condition:
user@host>
show chassis alarms
For information about the alarms, see
Table 30 on page 193
and
Table 31 on page 194
.
4.
Use the
show chassis fan
command to verify that the status of each fan is
OK
and that
the output display indicates that each of the fans are
Spinning at normal speed
.
user@host>
show chassis fan
Item Status RPM Measurement
Top Left Front fan OK 3420 Spinning at normal speed
Top Left Middle fan OK 3420 Spinning at normal speed
Top Left Rear fan OK 3450 Spinning at normal speed
Top Right Front fan OK 3420 Spinning at normal speed
Top Right Middle fan OK 3420 Spinning at normal speed
Top Right Rear fan OK 3420 Spinning at normal speed
Bottom Left Front fan OK 3420 Spinning at normal speed
Copyright © 2013, Juniper Networks, Inc.
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