Diagnostic Indicator

This chapter contains the following topics:

Diagnostic Indicator Overview

This chapter focuses on leveraging the built-in diagnostic indicators and Light Emitting Diodes (LEDs) commonly found on compute servers as powerful tools for rapid and effective troubleshooting. These visual cues provide immediate insights into the operational status of various hardware components, from power supplies and memory modules to network interfaces and storage drives, often pinpointing the exact location and nature of a problem without requiring extensive software diagnostics. The following topics explore how to interpret the different colors, blinking patterns, and combinations of these LEDs to quickly diagnose issues, minimize downtime, and streamline the repair process for your server infrastructure.

  • Front panel LED Indicators

  • Back panel LED Indicators

  • System Fan LED

  • SSD and NVMe Drivers LED Indicators

Front panel LED Indicators

Use the following LED indicators to help troubleshoot the back panel components.

Figure 1. Front panel LED Indicators
Table 1. Front panel LED Indicators
Component LED Description
1

Power Supply LED

2

Power Button with LED
3

UID Button with LED
4

RJ-45 with LED
Table 2. Power Button with LED
Indicator Code Condition
Off

Power Off/Pre-S5
Green Blink

S5
Green Solid On

S0
Amber Solid On

Fan abnormal or not installed
Table 3. UID Button with LED
Indicator Code Condition
Off

UID is off
Blue Solid On

UID is on /Pre-S5
Table 4. System Fan with LED
Indicator Code Condition
Off

Fan active
Red solid

Fan abnormal
Table 5. NVMe SSD LED
Indicator Code Condition
Off

Inactive
Green

Active

Back panel LED Indicators

Use the following LED indicators to help troubleshoot the back panel components.

Figure 2. Back panel LED Indicators
Table 6. Back panel LED Indicators
Component LED Description
1

Power Supply LED

2

Power Button with LED
3

UID Button with LED
4

RJ-45 with LED
Table 7. Power Button with LED
Indicator Code Condition
Off

Power Off/Pre-S5
Green Blink

S5
Green Solid On

S0
Amber Solid On

Fan abnormal or not installed
Table 8. UID Button with LED
Indicator Code Condition
Off

UID is off
Blue Solid On

UID is on /Pre-S5
Table 9. RJ-45 with LED
Indicator Code Condition
Left & Right -off

No connection
Left - Amber Blinking

Link and Active on Network
Right - Amber

Link and run 100Gbps
Right - Amber

Link and run 1Gbps
Table 10. Acbel 3200W Power Supply LED
Indicator Code Condition
Off

No connection
Green Blink

Active - Standby Power
Green Solid

Active - Normal Power
Amber

Inactive - AC Power - Off /Fail
Table 11. Delta 3200W Power Supply LED
Indicator Code Condition
Off

Inactive - PSU not detected or installed / No AC Power Input
Green Blink

Active - Standby Power
Green Solid

Active - Normal Power