Skip to main content

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 in socket 1 and 2
  • Two DRAM memory modules in slots 10 and 26
  • Two power supply units
  • Six system fans
  • One 2.5-inch drive, one M.2 drive, or one 7mm drive (if OS is needed for debugging)
Note
Depending on the power supply type, your power supply might look slightly different from the following illustration.

CFFv4 power supply LEDs​

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.

CRPS power supply LED​

Figure 2. CRPS power supply LED
CRPS power supply LED
Table 2. CRPS power supply LED
LEDDescription
1 Power supply status
The power supply status LED can be in one of the following states:

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

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

  • Slow blinking green (about one flash every second): The power supply is in PSU standby state with AC present, cold standby state, or always standby state.

  • Amber: The AC power cord is unplugged, AC power lost (with a second power supply in parallel still in AC power input power), or power supply has failed. To resolve the issue, replace the power supply.

  • Slow blinking amber (about one flash every second): Power supply warning events where the power supply continues to operate.

  • Fast blinking green (about 2 flashes each second): Power supply firmware updating.