The following alarms, LEDs, and other conditions indicate a problem with the cooling
system:
• A red alarm indicates that temperature of the router exceeds the maximum
(“temperature hot”) threshold.
• Automatic shutdown of the power supplies was 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.
In Table 95 on page 470, the text in the column labeled ”LCD Message” appears in the
display of the craft interface. The text in the column labeled “CLI Message” appears in
the output from the show chassis alarms command.
Table 95: T640 Cooling System Alarm Messages
SolutionAlarm ConditionCLI MessageLCD MessageAlarm TypeComponent
Replace the fan
tray.
A fan has failed.fan-name FailureFan FailureRedFans
Reinstall the fan
tray in the chassis.
A fan tray is missing
or too many fan
trays have failed.
Too many fans missing
or failing
Fans Missing
Reinstall the fan
tray in the chassis.
A fan tray has been
removed.
fan-name RemovedFan RemovedYellow
Check that all fan
trays are either
standard fan trays
or quiet fan trays.
Install the correct
fan trays.
NOTE: During an
upgrade, ignore
this alarm.
A mix of standard
front fan trays and
quiet front fan trays
are installed in the
chassis.
NOTE: During
normal operations,
mixing the standard
and quiet fan trays
is not supported.
Minor – Mix of
FAN-TRAYS
Mix of FAN-TRAYS
Copyright © 2017, Juniper Networks, Inc.470
T640 Core Router Hardware Guide
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