Juniper MX10008 Hardware Manual page 53

Table 11 on page 54 describes the functions of the fan tray LEDs.
Table 11: Fan Tray LEDs on an MX10008 Router
Name
Fan status
Fan tray controller status
Color State
Green On steadily
Green Blinking
Yellow Blinking
None Off
Green On steadily
Green Blinking
Yellow Blinking
None Off
Description
All fans are operating normally. The system
has verified that the fan tray is engaged,
that the airflow is in the correct direction,
and that all fans are operating correctly.
The beacon feature is enabled. This feature
is enabled using the request chassis
beacon command.
An error has been detected in one or more
fans in the fan tray. Replace the fan tray
as soon as possible. Either the fan has
failed or it has become disconnected. To
maintain proper airflow through the
chassis, leave the fan tray installed in the
chassis until you are ready to replace it.
The fan is not receiving power from the
fan tray controller.
The fan tray controller is online and is
operating normally.
The beacon feature is enabled. This feature
is enabled using the request chassis
beacon command.
An error has been detected in the fan tray
controller. Replace the fan tray controller
as soon as possible. The fan tray controller
is located behind the fan tray above the
SFBs. To maintain proper airflow through
the chassis, leave the fan tray installed in
the chassis until you are ready to replace
the fan tray controller.
The fan tray controller is not receiving
power.
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