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Troubleshooting
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Table 2 Troubleshooting chart
Problem Cause Solution
UPS will not start
Short circuit
Check the circuit protector on the rear of the UPS.
If it is tripped, reset it and restart the UPS. For
further help, contact your local dealer, Liebert
representative or the Liebert Worldwide Support
Group.
Battery disconnected or is
completely discharged
Check for proper connection of battery or
batteries.
UPS starts on battery, but will not
switch to AC
UPS not plugged in Plug in the power cord securely.
Circuit protector tripped Reset the circuit protector and restart the UPS.
Input voltage below threshold
Wait until the voltage rises to an appropriate level
or have the utility power checked by a qualified
electrician.
AC overvoltage
Wait until voltage lowers to an appropriate level
or have the utility power checked by a qualified
electrician.
UPS shuts down
Load exceeded UPS capacity
(110%), All Load Level Indicators
are illuminated; continuous beep
Check load level display and remove non-
essential loads. Recalculate the load and reduce
number of loads connected to UPS - the total
wattage of your equipment must not exceed the
capacity of the UPS.
Over temperature shutdown, Over
Temp Indicator lit; continuous
beep
Make sure that the UPS is operating in 32°F to
104°F (0°C to 40°C) and that it has adequate
ventilation.
MultiLink shutdown
Consult the MultiLink user manual or contact your
LAN administrator.
Internal UPS fault, Fault Indicator
Lit; continuous beep
Contact your local dealer, Liebert representative
or the Liebert Worldwide Support Group.
UPS shutdown due to a command
from the communications port(s),
Load Level 0-25% Indicator
illuminated
Your UPS has received a signal or command
from the attached computer. If this was
inadvertent, ensure the communication cable
used is correct for your system. For assistance,
contact your local dealer, Liebert representative
or the Liebert Worldwide Support Group.
AC Input is flashing
Site Wiring Fault, UPS detected a
line-to-neutral reversal or a loss of
proper grounding.
Have the utility checked by a qualified electrician.
All Battery Level Indicators
flashing
UPS is unable to perform manual
or remote battery test; beep every
half second for five seconds
Check battery connections,
completely power down and restart UPS.
NOTE: If the battery circuit opens while the UPS
is running, it will be detected when the next
battery test is performed.
Battery Indicator illuminated
amber; long beep every minute
UPS failed battery test Initiate battery test again.
Batteries weak Recharge batteries.
Batteries need to be replaced Replace batteries.
Over Temp Indicator flashing
Over temperature warning; beep
every half second
Make sure that the UPS is operating in 32°F to
104°F (0°C to 40°C) and that it has adequate
ventilation.
Fault Indicator lit but UPS is On
Fault warning; beep every half
second
Reset UPS.
NOTE
The 1920VA UPS will sound an Overload alarm under certain Low Line conditions when it is
fully loaded and it exceeds the input current rating. Unless the load is reduced, the condition
will trip the branch circuit breaker.