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Troubleshooting Chart
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 per-
sists, refer to the chart below:
Problem Cause Solution
UPS will not
start
Overload/
Short circuit
Check the circuit protector on the side
of the UPS. If it is tripped, reset it and
restart the UPS.
For further help, call your local dealer,
Liebert representative or the Liebert
Worldwide Support Group.
UPS starts
on battery,
but will not
switch to AC
UPS not plugged in Plug in power cord securely.
Circuit protector
tripped
Reset the circuit protector and restart
the UPS.
Power not available
at mains receptacle
Have the mains receptacle checked
by a qualified electrician.
Input voltage below
threshold
Wait until the voltage rises to an
appropriate level or have the mains
receptacle checked by a qualified
electrician.
AC overvoltage
Wait until voltage lowers to an
appropriate level or have the mains
receptacle checked by a qualified
electrician.
UPS shuts
down, Fault
Indicator lit
Overload/
Short circuit
Check the circuit protector on the rear
of the UPS. If it is tripped, reset it and
restart the UPS.
If the problem persists, disconnect
some of the equipment from your
UPS—the total wattage of your
equipment must not exceed the
capacity of the UPS. For further help,
call your local dealer, Liebert
representative or the Liebert
Worldwide Support Group.
Internal UPS fault
UPS not
providing
expected
backup time
Overload Reduce load.
Battery not charged
due to a recent
outage
Recharge battery.