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Power supply LEDs

This topic provides information about various power supply LED status and corresponding action suggestions.

The following minimal configuration is required for the server to start:

  • Two processors
  • Sixteen memory modules
    Note
    Memory module capacity varies based on the GPU complex:
    • With H100 GPU complex installed: 64 GB
    • With H200 GPU complex installed: 128 GB
  • Eight power supplies
  • One M.2 drive (If OS is needed by debugging)
  • Fifteen system fans
  • One rear PCIe Ethernet Adapter (If network is required)

The following table describes the problems that are indicated by various combinations of the power supply LEDs and the power-on LED and suggested actions to correct the detected problems.

Figure 1. CFFv4 power supply LEDs
CFFv4 power supply LEDs
Table 1. CFFv4 power supply LEDs
LEDDescription
1 Input status
The input status LED can be in one of the following states:

  • Off: The power supply is disconnected from the AC power source.

  • Green: The power supply is connected to the AC power source.

2 Output status
The output status LED can be in one of the following states:

  • Off: The server is powered off, or the power supply is not working properly. If the server is powered on but the output status LED is off, replace the power supply.

  • Slow blinking green (about one flash every two seconds): The power supply is in cold redundancy active mode.

  • Fast blinking green (about 2 flashes each second): The power supply is in cold redundancy sleep mode.

  • Green: The server is on and the power supply is working normally.

3 Fault LED

  • Off: The power supply is working normally

  • Amber: The power supply may have failed. Dump the FFDC log from the system and contact Lenovo back end support team for PSU data log reviewing.