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Troubleshooting Guide
Problem Cause Solution
UPS fails to start
when the ON button
is pressed.
UPS is short circuited or over-
loaded.
Ensure UPS is OFF. Disconnect
all loads and ensure nothing is
lodged in output receptacles.
Ensure loads are not defective
or shorted internally.
Battery indicator
LED is illuminated.
UPS not plugged in.
UPS is operating from battery
mode, make certain UPS is
securely plugged into the wall
receptacle.
UPS input protection fuse has
blown/opened.
UPS is operating from battery
mode. Save data and close
applications. Replace UPS
input fuse, then restart UPS.
Utility voltage out of UPS input
range.
UPS is operating from battery
mode. Save data and close
applications. Ensure utility sup-
ply voltage is within acceptable
limits for UPS.
UPS has reduced
battery time.
Batteries are not fully charged.
Keep UPS plugged in continu-
ously at least 24 hours to
recharge batteries.
UPS is overloaded.
Check load level display and
reduce the load on the UPS.
Batteries may not be able to
hold a full charge due to age.
Replace batteries. Contact your
local dealer, Liebert representa-
tive or the Liebert Worldwide
Support Group for replacement
battery kit.
Fault and Bypass
indicator LEDs and
all load level LEDs
are illuminated.
UPS overloaded or load equip-
ment is faulty.
Check load level display and
remove non-essential loads.
Recalculate the load and
reduce number of loads con-
nected to UPS. Check load
equipment for faults.
Fault and Bypass
indicator LEDs and
diagnostic LED A are
illuminated.
UPS internal fan has a problem
or UPS shutdown due to tem-
perature condition. Load is on
bypass power.
Ensure UPS is not overloaded,
ventilation openings not
blocked, or room ambient tem-
perature is not excessive. Wait
30 minutes to allow UPS to
cool, then restart UPS. If UPS
does not restart, contact your
local dealer, Liebert representa-
tive or the Liebert Worldwide
Support Group.
Fault and Bypass
indicator LEDs and
diagnostic LED B are
illuminated.
UPS internal DC bus overvolt-
age.
UPS requires service. Contact
your local dealer, Liebert repre-
sentative or the Liebert World-
wide Support Group.
Fault and Bypass
indicator LEDs and
diagnostic LED C
are illuminated.
UPS control power supply fault.
UPS requires service. Contact
your local dealer, Liebert repre-
sentative or the Liebert World-
wide Support Group.