Each hot-swap power supply has three status LEDs.
LED Description
3 Power input LED
• Off: The power supply is disconnected from the ac power source or a power problem
occurs.
• Green: The power supply is connected to the ac power source.
4 Power output LED
• 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, 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.
• 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.
5 Power supply error LED
• Off: The power supply is working normally.
• Yellow: The power supply has failed. To resolve the issue, replace the power supply.
24 ThinkSystem ST250 V2 Setup Guide
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