11
PROBLEM REASON SOLUTION
UPS unplugged. Switch UPS off, verify installation per
instructions, and plug securely into utility.
Low utility voltage, no utility
voltage, or reversed input
line and neutral conductor.
Call your maintenance department, qualified
electrician, or utility company to correct
voltage, or wait until utility voltage returns to
normal.
UPS output short-circuited
or overloaded.
Switch UPS off and disconnect all loads.
Verify that nothing is lodged in output
receptacles. Check loads for defects or
short circuits.
Excessively high UPS
temperature. Allow a few minutes for the UPS to cool
down. Check for adequate ventilation.
Restart the UPS.
Blown internal input fuse. Contact Liebert Technical Support.
UPS fails to start up
when turned ON.
Improper utility outlet wiring
or ground fault. All front
panel indicators flash with
no power supplied to loads.
Call maintenance department or a qualified
electrician to correct the problem.
AC LED flashes
Utility voltage too high. Shutdown load equipment, disconnect UPS,
and call your maintenance department or a
qualified electrician to correct outlet wiring
or ground fault.
Battery indicator lights
& alarm sounds.
Utility power failure Limited time before UPS shutdown.
Terminate critical applications and save
data. Shutdown all loads and the UPS.
Batteries uncharged
Reduced battery time Batteries unable to hold
charge due to age
Plug UPS in and turn ON for a minimum of
4 hours to recharge batteries.
Fault LED flashes
Alarm sounds twice
per second
Fan operates at a
high speed
UPS overheated
Check for UPS overload, blocked ventilation
openings, and excessively high room
temperature.
UPS shutdown, fault
LED & diagnostic LED
“A” light
UPS critically overheated Check for UPS overload, blocked ventilation
openings, and excessively high room
temperature. Allow UPS to cool for 30
minutes, the restart.
UPS shutdown, fault
LED & diagnostic LED
“B” light
UPS overload Reduce loads to UPS. Consult Liebert
Technical Support.
UPS shutdown, fault
LED & diagnostic LED
“C” light
Internal fault Requires service. Contact Liebert Technical
Support.
UPS shutdown, fault
LED & diagnostic LED
“D” light
UPS short-circuit Remove cause of short-circuit, if obvious.
Check loads connected to UPS for defects
or shorts.
UPS shutdown, fault
LED & diagnostic LED
“E” light
Internal fault Requires service. Contact Liebert Technical
Support.
UPS shutdown, fault
LED & diagnostic LED
“F” light
Battery charge exhausted Plug UPS in and turn ON for a minimum of
4 hours to recharge batteries. We advise
you not to run critical application during this
period.
UPS shutdown, fault
LED & diagnostic LED
“G” light
Shut down command sent
to communication port If inadvertent, check system for correct
cabling.