The UPS fails to turn on and no LED lights up
Possible cause
Solution
Low battery voltage
Charge battery for at least 8 hours
The battery is defective
Replace it with the same type of battery
Power switch is not in the depressed
position
Press power switch again
Audible alarm buzzer beeps continuously when AC input line
is normal
Possible cause
Solution
The UPS is overloaded
Verify that the load matches the UPS capability
specified in the specs
When power fails, backup time falls below rated levels
Possible cause
Solution
The UPS is overloaded
Remove the least critical load
Low battery voltage
Charge battery for at least 8 hours
Battery failure due to high temperature
or degraded performance
Replace it with the same type of battery
Communication lost between UPS and computer
Possible Cause
Solution
Software is not installed correctly
Check the settings of the software
Cable is not properly connected
Make sure the USB cable is firmly connected to the
COM1/COM2 port of the computer and confirm the
setting again
Even when mains supply is normal, the LED still displays battery
mode
Possible Cause
Solution
Circuit breaker trips
Reset the circuit breaker
Power cord is loose
Reconnect the power cord properly
* For further assistance, please contact us at [email protected] • When replacing your
batteries, we recommend using a Forza FUB-1290.
