Figure 1 shows the location of the LEDs on the power supply.
Figure 1: Power Supply LEDs in a QFX3500 Device

Table 1 describes the LEDs on the AC power supplies in QFX3500 devices.
Table 1: AC Power Supply LEDs in QFX3500 Devices
LED | Color | State | Description |
|---|---|---|---|
AC OK | Unlit | Off | The power supply is disconnected from power, or power is not coming into the power supply. |
Green | On steadily | Power is coming into the power supply. | |
DC OK | Unlit | Off | The power supply is disconnected from power, or the power supply is not sending out power correctly. |
Green | On steadily | The power supply is sending out power correctly. | |
Fault | Amber | On steadily | An error has been detected in the power supply. Replace the power supply as soon as possible. To maintain proper airflow through the chassis, leave the power supply installed in the chassis until you are ready to replace it. |
![]() | Note: If the AC OK LED and the DC OK LED are unlit, either the AC power cord is not installed properly or the power supply fuse has failed. If the AC OK LED is lit and the DC OK LED is unlit, the AC power supply is installed properly, but the power supply has an internal failure. |