Table 9. AC power indicators
Convention
Power indicator
pattern
Condition
A
Green
The handle indicator lights green indicating that a valid power
source is connected to the power supply unit and that the power
supply unit is operational.
B
Flashing green
When updating the firmware of the power supply unit, the power
supply unit handle flashes green.
C
Flashing green
and turns off
When hot-adding a power supply unit (PSU), the power supply unit
handle flashes green five times at 4 Hz rate and turns off. This
indicates that the power supply unit is mismatched with the other
power supply unit (in terms of efficiency, feature set, health status,
and supported voltage). Replace the power supply unit that has the
flashing indicator with a power supply unit that matches the capacity
of the other installed power supply unit.
NOTE: For AC power supply units, use only PSUs with the
Extended Power Performance (EPP) label on the back. Mixing
PSUs from previous generations of servers can result in a PSU
mismatch condition or failure to power on.
D
Flashing amber
Indicates a problem with the power supply unit.
CAUTION: When correcting a power supply unit mismatch,
replace only the power supply unit with the flashing indicator.
Swapping the opposite power supply unit 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 power
down the system.
CAUTION: AC power supplies support both 220 V and 110 V
input voltages. When two identical power supplies receive
different input voltages with the exception of Titanium power
supplies, which support only 220 V. When two identical power
supplies receive different input voltages, they can output
different wattages, and trigger a mismatch.
CAUTION: If two power supplies are used, they must be of the
same type and have the same maximum output power.
CAUTION: Combining AC and DC power supplies is not
supported and triggers a mismatch.
E
Not lit
Power is not connected.
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