8
TROUBLESHOOTING
If the UPS fails to operate properly, turn off the unit and repeat the steps in the installation
section of this manual. If the problem persists, refer to the chart below:
PROBLEM
CAUSE
SOLUTION
UPS will not start
Overload/Short Circuit
Check fuse at rear of UPS. If blown, replace it
and restart the UPS. For further help, call your
Liebert representative
UPS starts on
battery, but will
not switch to AC
UPS not plugged in
Fuse blown
Power not available at
utility receptacle
Input voltage below
threshold
AC overvoltage
Plug in power
cord securely
Replace fuse and restart UPS
Call a qualified electrician
Wait until voltage rises to appropriate level
Voltage must be higher than 185VAC
AC voltage must be less than 263VAC
UPS shuts down
Overload/Short Circuit
Low Battery
Check the fuse holder at rear of UPS. If fuse is
blown, replace it and restart the UPS. If problem
persists, disconnect some of the equipment from
your UPS - the total wattage of your equipment
may exceed the capacity of the UPS. For
further help, call your Liebert representative
Turn OFF equipment and recharge UPS battery
for at least 7 to 10 hours. If problem persists,
contact your Liebert representative
