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Use the chart below to solve minor UPS installation problems. Contact APC Technical Support Staff for assistance with
complex UPS problems. See APC Contact Information page 12, for a location near you.
Problem and Possible Cause Solution
UPS will not turn on.
•=ON button not pushed. Press the ON button once to power the UPS and the load.
•=UPS not connected to AC power supply. Check that the power cable from the UPS to the power
supply is securely connected at both ends.
•=UPS input circuit breaker tripped. Reduce the load on the UPS by unplugging equipment and
reset the circuit breaker (on back of UPS) by pressing the
plunger back in.
•=Very low or no utility voltage. Check the AC power supply to the UPS with a table lamp.
If very dim, have the utility voltage checked.
•=Battery not connected properly. Confirm the battery connections.
UPS will not turn off.
•=Internal UPS fault. Do not attempt to use the UPS. Unplug the UPS and have it
serviced immediately.
UPS operates on-battery although normal line voltage exists.
•=UPS’s input circuit breaker tripped. Reduce the load on the UPS by unplugging equipment and
reset the circuit breaker (on back of UPS) by pressing the
plunger back in.
•=Very high, low, or distorted line voltage.
Inexpensive fuel powered generators can distort
the voltage.
Move the UPS to a different outlet on a different circuit.
Test the input voltage with the utility voltage display. If
acceptable to the load, reduce the UPS’s sensitivity. Refer
to Voltage Sensitivity, page 6, for procedures.
UPS beeps occasionally.
•=Normal UPS operation. None. The UPS is protecting the load.
UPS does not provide expected backup time.
•=The UPS’s battery is weak due to recent outage or
is near the end of its service life.
Charge the battery. Batteries require recharging after
extended outages. Also, they wear faster when put into
service often or when operated at elevated temperatures.
If the battery is near the end of its service life, consider
replacing the battery even if the replace battery indicator is
not yet lit.
•=The UPS is overloaded. Check the UPS’s load display. Unplug less needed
equipment, such as printers.
Front panel indicators flash sequentially.
•=The UPS has been shut down by remote control. None. The UPS will restart automatically when utility
power returns.
All indicators are lit and UPS emits a constant beeping.
•=Internal UPS fault. Do not attempt to use the UPS. Turn the UPS off and have
it serviced immediately.
All indicators are off and UPS is plugged into wall outlet.
•=The UPS is shut down and the battery is
discharged from an extended outage.
None. The UPS will return to normal operation when the
power is restored and the battery has a sufficient charge.
The replace battery light is lit.
•=Weak batteries. Do another self test to see if it clears.
•=Replacement batteries not connected properly. Confirm the battery connections.