Troubleshooting The T4000 Cooling System; Table 83: T4000 Cooling System Fan Tray Alarms - Juniper T4000 Hardware Manual

Troubleshooting the T4000 Cooling System

Problem

Table 83: T4000 Cooling System Fan Tray Alarms

Alarm
Type LCD Message
Red Fan Failure
Fans Missing
<fan-name> Improper
Yellow
Fan Removed
Copyright © 2018, Juniper Networks, Inc.
Description:
The following alarms, LEDs, and other conditions indicate a problem with the cooling
system:
A red alarm indicates that the temperature of the router exceeds the maximum
("temperature hot") threshold.
Automatic shutdown of the power supplies can be caused by the temperature of the
router exceeding the maximum ("temperature hot") threshold. The control board turns
off the power supplies because the router temperature exceeds the acceptable
maximum.
A red alarm indicates that a fan failed.
A yellow alarm indicates that the router temperature exceeds the "temperature warm"
threshold.
A yellow alarm indicates that one of the fan trays was removed.
One or more fans in a fan tray function at full speed. The control boards constantly
monitor the temperatures detected by sensors on the midplane and router components,
adjusting the speed of the fans as necessary. If one fan fails, the host subsystem adjusts
the speed of the remaining fans to maintain proper cooling.
CLI Message
fan-name Failure
Too many fans
missing or failing
<fan-name>
Improper for
Platform
Incompatible rear
fan tray or front fan
tray detected
fan-name Removed
Chapter 36: Troubleshooting Components
Alarm Condition Solution
A fan has failed. Replace the fan tray.
A fan tray is missing Reinstall the fan tray
or too many fan trays in the chassis.
have failed.
A fan tray is Replace with an
unsupported for the appropriate fan tray.
T4000 router. For a list of supported
fan trays, see
Cooling System
Description" on
page
An incompatible fan Replace with an
tray is inserted into appropriate fan tray.
the chassis.
A fan tray has been Reinstall the fan tray
removed. in the chassis.
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