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Power supply unit indicator codes
AC power supply units (PSUs) have an illuminated translucent handle that serves as an indicator. The indicator shows if power is
present or if a power fault has occurred.
1. AC PSU handle
2. Socket
3. Release latch
The following table describes the power indicator codes:
Power indicator
codes
Green
Blinking amber
Not powered on
Blinking green
Blinking green and
powers off
38
System diagnostics and indicator codes
Condition
Indicates that a valid power source is connected to the PSU and the PSU is operational.
Indicates an issue with the PSU.
Indicates that the power is not connected to the PSU.
Indicates that the firmware of the PSU is being updated.
CAUTION:
Do not disconnect the power cord or unplug the PSU when updating firmware.
If firmware update is interrupted, the PSUs will not function.
When hot-plugging a PSU, it blinks green five times at a rate of 4 Hz and powers off. This indicates a
PSU mismatch due to efficiency, feature set, health status, or supported voltage.
If two PSUs are installed, you must ensure that:
● Both PSUs must have the same type of label. For example, Extended Power Performance (EPP)
label.
● They must be of the same type and have the same maximum output power.
CAUTION:
Do not mix PSUs from previous generations of PowerEdge servers, even if the
PSUs have the same power rating. This results in a PSU mismatch condition or failure to
power on the system.
CAUTION:
When correcting a PSU mismatch, replace the PSU with the blinking
indicator. Do not swap the PSU to make a matched pair. This can result in an erroneous
condition and an unexpected system shutdown.
CAUTION:
To change from a high output configuration to a low output configuration or
vice versa, you must power off the system.
CAUTION:
AC PSUs support both 240 V and 120 V input voltages with the exception of
Titanium PSUs, which support only 240 V. When two identical PSUs receive different
input voltages, they can output different wattages, and trigger a mismatch.
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