AC power-supply LEDs

The following minimum configuration is required for the DC LED on the power supply to be lit:
  • Power supply
  • Power cord
Note: You must turn on the server for the DC LED on the power supply to be lit.
The following illustration shows the locations of the power-supply LEDs on the ac power supply.
Figure 1. AC power-supply LEDs
AC power-supply LEDs
The following table describes the problems that are indicated by various combinations of the power-supply LEDs on an ac power supply and suggested actions to correct the detected problems.

Four column table for documenting the AC power-supply LEDs, the corresponding description, action and notes.

AC power-supply LEDs Description Action Notes
AC DC Error (!)
On On/ Blinking Off Normal operation.   When the DC LED is blinking as a 1Hz rate, the PSU is at STANDBY mode, i.e. no DC power output from this PSU
Off Off Off No ac power to the server or a problem with the ac power source.
  1. Check the ac power to the server.
  2. Make sure that the power cord is connected to a functioning power source.
  3. Restart the server. If the error remains, check the power-supply LEDs.
  4. If the problem remains, replace the power-supply.
 This is a normal condition when no ac power is present.
Off Off On The power supply has failed. Replace the power supply.  
Off On/ Blinking Off The power supply has failed. Replace the power supply.  
Off On/ Blinking On The power supply has failed. Replace the power supply.  
On Off Off Power-supply not fully seated, faulty system board, or the power supply has failed.
  1. Reseat the power supply.
  2. Use the Power Configurator utility to ensure current system power consumption is under limitation. For more information and to download the utility, go to the IBM Power Configurator website.
  3. Check the error LEDs on the system board and the IMM2 error messages. Follow steps in Power problems and Solving power problems until the problem is solved.
Typically indicates a power-supply is not fully seated.
On Off On The power supply has failed. Replace the power supply.  
On On/ Blinking On The power supply has failed. Replace the power supply.  
Parent topic: Power-supply LEDs