Power Supply Unit Indicator Codes
AC power supply units (PSUs) have an illuminated translucent handle that serves as an indicator. The indicator shows whether power is present or if a power fault has occurred.

- AC PSU status indicator/handle.
Power Indicator Codes | Condition |
Green | A valid power source is connected to the PSU, and the PSU is operational. |
Blinking amber | Indicates a problem with the PSU. |
Not illuminated | Power is not connected to the PSU. |
Blinking green | When the firmware of
the PSU is being updated, the PSU handle blinks green. CAUTION: Do not
disconnect the power cord or unplug the PSU when updating the
firmware. If the firmware update is interrupted; the PSUs do not
function.
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Blinking green and turns off | When hot-plugging a
PSU, the PSU handle blinks green five times at a rate of 4 Hz and turns
off. This indicates a PSU mismatch concerning efficiency, feature set,
health status, or supported voltage. CAUTION: If two
PSUs are installed, both the PSUs must have the same type of label;
for example, Extended Power Performance (EPP) label. Mixing PSUs
from previous generations of PowerEdge servers is not supported,
even if the PSUs have the same power rating. This results in a PSU
mismatch condition or failure to turn the system on.
CAUTION: When
correcting a PSU mismatch, replace only the PSU with the blinking
indicator. Swapping the PSU to make a matched pair can result in an
error condition and unexpected system shutdown. To change from a
high output configuration to a low output configuration or vice
versa, you must turn off the system.
CAUTION: AC
PSUs support both 240 V and 120 V input voltages except for Titanium
PSUs, which support only 240 V. When two identical PSUs receive
different input voltages, they can output different wattage, and
trigger a mismatch.
CAUTION: If
two PSUs are used, they must be of the same type and have the same
maximum output power.
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