APC BX1500G User Manual

The Back-UPS is not connected to AC 
power.

Be sure that the Back-UPS is securely 
connected to an AC outlet.

The circuit breaker has been tripped.

Disconnect non-essential equipment from the 
Back-UPS. Reset the circuit breaker. Re-
connect equipment one item at a time. If the 
circuit breaker is tripped again, disconnect the 
device that caused the event.

The internal battery is not connected.

Connect the battery.

The AC input voltage is out of range.

Adjust the transfer voltage and sensitivity 
range.

• The Back-UPS power cord is not securely 

connected to the wall outlet. 

• The wall outlet is no longer receiving AC 

power. 

• The circuit breaker has been tripped.

Verify that the plug is fully inserted into the 
wall outlet. Verify that the wall outlet is 
receiving AC power by checking it with 
another device.

The Back-UPS is performing an automatic 
self test.

No action is necessary.

• The AC input voltage is out of range.
• The frequency is out of range.
• The waveform is distorted.

Adjust the transfer voltage and sensitivity 
range.

The Back-UPS may be experiencing an 
overload condition.

Disconnect non-essential equipment from the 
Battery Backup outlets.

The battery was recently discharged due to 
a power outage and has not fully recharged.

Charge the battery for eight hours.

The battery has reached the end of its 
service life.

Replace the battery.

The B

ATTERY

 and 

ONLINE

 

The battery has reached the end of its 
service life.

Replace the battery.

BATTERY

The equipment connected to the 
Back-UPS is drawing more power than the 
Back-UPS can provide.

Disconnect non-essential equipment from the 
Battery Backup outlets.

The building wiring presents a shock 
hazard that must be corrected by a qualified 
electrical.

Do not operate the Back-UPS. Call a qualified 
electrician to correct the building wiring fault.