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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
  • Two memory modules
  • One power supply
  • One M.2 drive (If OS is needed by debugging)
  • Six front fans
  • Five rear fans
  • One rear PCIe Ethernet Adapter (If network is required)
  • CPU water loop connected to water (If connected to DC power)

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.