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Power supply LEDs

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

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

  • One processor in processor socket 1 (processor TDP smaller than 200 watts)
  • One DRAM DIMM in DIMM slot 10
  • One power supply unit in PSU slot 1
  • One drive with RAID adapter and backplane (if OS is needed for debugging)
  • Three single rotor fans in fan slots 1, 2, and 4, and one fan filler in fan slot 3

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

Figure 1. Power supply LEDs
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.

Zero-output mode can be disabled via Setup utility or Lenovo XClarity Controller web interface. If you disable zero-output mode, both power supplies will be in the active state.

  • Start the Setup utility, go to System Settings > Power > Zero Output and select Disable. If you disable zero-output mode, both power supplies will be in the active state.

  • Log in to the Lenovo XClarity Controller web interface, choose Server Configuration > Power Policy, disable Zero Output Mode, and then click Apply.

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.