LED Description
1 Input status The input status LED can be in one of the following states:
• Off: The power supply is disconnected from the input power source.
• Green: The power supply is connected to the input power source.
2 Output status The output status LED can be in one of the following states:
• Green: The server is on and the power supply is working normally.
• Blinking green: The power supply is in zero-output mode (standby). When the server power
load is low, one of the installed power supplies enters into the standby state while the other
one delivers entire load. When the power load increases, the standby power supply will switch
to active state to provide sufficient power to the server.
To disable zero-output mode, log in to the Lenovo XClarity Controller web interface, choose
Server Configuration ➙ Power Policy, disable Zero Output Mode, and then click Apply. If
you disable zero-output mode, both power supplies will be in the active state.
• Off: The server is powered off, or the power supply is not working properly. If the server is
powered on but the power output LED is off, replace the power supply.
Zero-output mode can be disabled via Lenovo XClarity Controller web interface. Log in to the
Lenovo XClarity Controller web interface, choose Server Configuration ➙ Power Policy, disable
Zero Output Mode, and then click Apply. If you disable zero-output mode, both power supplies
will be in the active state.
3 Power supply
error LED
• Off: The power supply is working normally
• Yellow: Dump the FFDC log from affected systems and escalate to next level for PSU data log
reviewing.
System-board-assembly LEDs
The following illustrations show the light-emitting diodes (LEDs) on the system board assembly which
contains the system I/O board and the processor board.
Chapter 8. Problem determination 297
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