Juniper QFX5220, Hardware Manual, Page: 57 / 247

Figure 18: Fan Module LEDs on a QFX5220-32CD
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Fan module LED
Table 14 on page 59 describes the function of the fan tray LED.
Table 14: Fan Tray LED Behavior in a QFX5220
Description State Color Name
The fan module is operating normally. The system
has verified that the module is engaged, that the
airflow is in the correct direction, and that the
fan is operating correctly.
On steadily Green Fan
An error has been detected in the fan module.
Replace the fan module as soon as possible.
Either the fan has failed or it is seated incorrectly.
To maintain proper airflow through the chassis,
leave the fan module installed in the chassis until
you are ready to replace it.
Blinking Amber
Under normal operating conditions, the fan modules operate at a moderate speed. Temperature sensors
in the chassis monitor the temperature within the chassis.
The system raises an alarm if a fan module fails or if the ambient temperature inside the chassis rises above
the acceptable range. If the temperature inside the chassis rises above the threshold temperature, the
system shuts down automatically.
Fan Module Status
You can check the status of fan modules through the show chassis temperature-thresholds, show system
alarm, or show chassis environment commands, or by looking at the LEDs next to each fan module. For
example:
user@device>
show chassis environment
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