APC 3000 - Manual (Page 16)

13 Smart-UPS 750/1000/1500/2200/3000 VA 120/230 Vac Tower
The replace battery indicator is illuminated
The battery has a weak charge. Allow the battery to recharge for at least four hours. Then, perform a self-test.
If the problem persists after recharging, replace the battery.
The replacement battery is not properly
connected. Ensure that the battery connector is securely connected.
The display interface has a Site Wiring Fault message
Wiring faults detected include missing
ground, hot-neutral, polarity reversal,
and overloaded neutral circuit. If the UPS indicates a site wiring fault, have a qualified electrician inspect the
building wiring. (Applicable for 120 V units only.)
Problem and Possible Cause Solution