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Fault and Bypass
indicator LEDs and
diagnostic LED D
are illuminated.
UPS PFC (Power Factor Cor-
rection Circuit) fault.
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 E are
illuminated.
UPS inverter fault.
UPS requires service. Contact
your local dealer, Liebert Rep-
resentative or the Liebert
Worldwide Support Group.
Fault indicator LED
and diagnostic
LED A and C are illu-
minated.
UPS failed the battery test.
Replace batteries. Contact your
local dealer, Liebert representa-
tive or the Liebert Worldwide
Support Group.
Fault and Bypass
indicator LEDs and
diagnostic LED C
and E are illumi-
nated.
UPS shutdown due to a com-
mand from the communica-
tions port(s).
Your UPS has received a signal
or command from the attached
computer. If this was inadvert-
ent, ensure the communication
cable used is correct for your
system. For assistance, con-
tact your local dealer, Liebert
representative or the Liebert
Worldwide Support Group.
AC LED is
flashing.
UPS detected a line-to-neutral
reversal or a loss of proper
grounding; continuous horn and
UPS will not start.This is active
only when power is first applied
to the input. Once the UPS is
running, the AC LED will not
start flashing, even if the input
wiring is changed.
Contact a qualified electrician to
verify site wiring.
Battery LED is
flashing.
Battery source is not available;
continuous horn.
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.
Bypass LED is
flashing.
Bypass voltage is present, but
is disabled for use because the
voltage or frequency is outside
acceptable limits.
The AC input powers the PFC
input and serves as the bypass
source. If the AC is present but
the voltage or frequency
exceeds the acceptable range
for safe operation with a load,
the bypass will be disabled and
this LED will flash, indicating
that the bypass is unavailable.
Troubleshooting Guide (Continued)
Problem Cause Solution