Lenovo NeXtScale nx360 M4 Installation And Service Manual page 66

AC power DC power
LED (green) LED (green)
Figure 13. 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.
AC power-supply LEDs
AC DC Error (!)
On On
Off Off
Off Off
Off On
Off On
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IBM NeXtScale nx360 M4 Installation and Service Guide
Power-supply
error LED (yellow)
Description
Off Normal operation.
Off No ac power to the
server or a problem
with the ac power
source.
On The power supply
has failed.
The power supply
Off
has failed.
On The power supply
has failed.
Action
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.
Replace the power supply.
Replace the power supply.
Replace the power supply.
Notes
This is a normal
condition when no ac
power is present.