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On the front of the PSU, if the AC Present LED is illuminated, then AC is detected and within tolerance. If the
DC Present LED is illuminated, then the PSU is supplying DC to the chassis. The AC Present LED on the
rear of the chassis, when illuminated, indicates that AC is detected.
FAN LED Behavior
The Fans are inserted in the front and the back of the chassis (Figure 8) and contain one LED: Power/Status LED
(Green or Amber).
Figure 6 – Front Fans Power/Status LED Figure 7 – Rear Fans Power/Status LED
The Power/Status/Identification (color is dependent on status) LED states will be as follows:
Fan Health
Power/Status LED State
Off
LED_OFF
Healthy
LED ON (Green)
Fault
LED ON (Amber-blinking)
Firmware Update in Progress
LED ON (Green-blinking)
Conclusion: A thorough understanding of the physical LED status can ensure efficient health status and
provide feedback for timely troubleshooting. The PowerEdge MX management module, compute sleds,
storage sleds, IO Modules, power supply, and fans, each have LED state indicators that deliver identification
on specific features.