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VS375C/VS575C 15
5. TROUBLESHOOTING
If the UPS fails to operate properly, please review the following steps before calling the
repair center:
1. Is the UPS plugged into a proper working outlet?
2. Is the line voltage within the rating specified?
3. Does the circuit breaker on the rear panel need to be reset?
5.1 Troubleshooting Chart
Problem Possible Cause Corrective Action
UPS front panel on/off
switch has not been
pressed
Press the On/Off switch for
two seconds
Load less than 20W at
battery mode
Normal condition, “No load
shutdown function” is
active
Battery voltage less than
10V
Recharge the UPS for at
least 6 hours
UPS can not turn on
and has no alarm.
PCB failure
Contact dealer or OPTI-
UPS service
Very low or very high line
voltage.
Normal condition
UPS input power cord is
not plugged in
Plug in input power cord
Battery LED (amber)
is lit and UPS beeps
every 4 seconds
AC Fuse burned out Replace the AC fuse
The UPS Overload
LED (red) is always lit
& there is a
continuous sounding
alarm
UPS is overloaded
Remove the least critical
devices from the load
The UPS Battery
Weak LED (red) is
always lit
Battery voltage
too low
Dead battery
Recharge the battery and
reset
Backup time is less
than the rating
Battery is not fully charged
or battery is dead
Plug the UPS into an AC
outlet and recharge the
battery for 6 hours. If
problem remains, replace
the battery
UPS appears to be
functioning normally
but the computer
won’t turn on
Computer input power cord
is loose or not connected
Check the computer input
power cord
Software
communication not
working
Wrong interface cable Purchase the correct one
from your distributor