Figure 1 shows the location of the LED on the fan tray.
Figure 1: Fan Tray LED in a QFX3500 Device

Table 1 describes the function of the fan tray LED.
Table 1: Fan Tray LED in a QFX3500 Device
Name | Color | State | Description |
|---|---|---|---|
Fan | Green | On steadily | The fan tray is operating normally. |
Amber | Blinking | An error has been detected in the fan tray. Replace the fan tray as soon as possible. To maintain proper airflow through the chassis leave the fan tray installed in the chassis, until you are ready to replace it. |