CertaUPS C500, Installation Manual, Page: 46 / 54

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Back feed
Fault (Red) LED is On.
Beep continuous.
Code: F093 UPS has a unexpected bypass
current on battery mode Transfer to maintenance
bypass and call service.
Inv Overload Fault
Fault (Red) LED is On
Beep continuous.
Code: F042 UPS has transferred to bypass
or fault mode because of
overload in inverter mode The UPS transfers to
Battery mode if supporting
the load.
Remove some of the
output load from the UPS
Bypass Overload Fault
Fault (Red) LED is On.
Beep continuous.
Code: F043 UPS has cut off the output
and transferred to fault mode
because of overload in bypass
mode or HE mode. Remove some of the
output load from the UPS
Output Short Circuit
Fault (Red) LED is On.
Beep continuous.
Code: F031 Indicates that the UPS has
detected abnormally low
impedance placed on its
output and considers it a
short circuit Remove all output loads.
Turn off the UPS.
Check UPS output for
possible short circuit.
Ensure short circuit is
removed before turning on
again.
Fan Failure
Fault (Red) LED is flash
1 beep every 1 second
Code: A085 Indicates that the fan could
not operate normally Check fans of UPS
BUS Over Voltage
Fault (Red) LED is On.
Beep continuous.
Code: F021 Indicates that the UPS is
reporting a BUS over voltage
fault. The UPS transfers to
Bypass mode if supporting
the load
BUS Under Voltage
Fault (Red) LED is On.
Beep continuous.
Code: F022 Indicates that the UPS is
reporting a BUS under
voltage fault. The UPS transfers to
Bypass mode if supporting
the load
BUS Unbalance
Fault (Red) LED is On.
Beep continuous.
Code: F023 Indicates that the positive
BUS voltage and negative BUS
voltage are out of tolerance. The UPS transfers to
Bypass mode if supporting
the load