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TROUBLESHOOTING GUIDE
PROBLEM CAUSE SOLUTION
UPS is short circuited or
overloaded
Ensure UPS is off. Disconnect all loads
and ensure nothing is lodged in output
sockets. Ensure loads are not defective
or shorted internally.
UPS fails to start when
on button is pressed
Internal fuse is blown,
indicating internal fault
Do not attempt to open or service the
UPS. Contact your dealer or LTS.
UPS not plugged in UPS is operating from battery mode,
make certain UPS is securely plugged
into the wall socket
UPS input protection has
opened
UPS is operating from battery mode.
Save data and close applications.
Replace UPS input fuse or reset input
breaker, then restart UPS.
Battery indicator is
illuminated
Mains voltage out of UPS
input range.
UPS is operating from battery mode.
Save data and close applications.
Ensure mains supply voltage is within
acceptable limits for UPS.
Batteries not fully charged Keep UPS plugged in continuously at
least 24 hours to recharge batteries
UPS is overloaded Check load level display and reduce load
level
UPS has reduced battery
time
Batteries may not be able to
hold a full charge due to age
Replace batteries. Contact your dealer
or LTS for replacement battery kit
Fault and Bypass
indicators and all load
level LEDs are
illuminated
UPS overloaded or load
equipment is faulty
Check load level display and remove
non-essential loads. Recalculate load
VA and reduce number of loads
connected to UPS. Check load
equipment for faults.
Fault and Bypass
indicators and diagnostic
LED A are illuminated
UPS internal fan has a
problem or UPS shutdown
due to temperature condition.
Load is on bypass power
Ensure UPS is not overloaded,
ventilation openings not blocked, or room
ambient temperature not excessive.
Wait 30 minutes to allow UPS to cool,
then restart UPS. IF it does not restart,
contact your dealer or LTS.
Fault and Bypass
indicators and diagnostic
LED B are illuminated
UPS internal DC bus
overvoltage
UPS requires service. Contact your
dealer or LTS.
Fault and Bypass
indicators and diagnostic
LED C are illuminated
UPS power control fault. UPS requires service. Contact your
dealer or LTS.
Fault and Bypass
indicators and diagnostic
LED D are illuminated
UPS PFC fault. UPS requires service. Contact your
dealer or LTS.
Fault and Bypass
indicators and diagnostic
LED E are illuminated
UPS inverter fault. UPS requires service. Contact your
dealer or LTS.
Fault and Bypass
indicators and diagnostic
LED A & C are
illuminated
UPS failed the battery test. Replace batteries. Contact your dealer
or LTS.
Fault and Bypass
indicators and diagnostic
LED C & E are
illuminated
UPS shutdown due to a
command from the
communications port(s)
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 dealer or LTS.