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4. Troubleshooting
If the UPS system does not operate correctly, please solve the problem by using the table below.
Symptom Possible cause Remedy
The AC input power is not
connected well.
Check if input power cord
firmly connected to the
mains.
No indication and alarm even
though the mains is normal.
The AC input is connected
to the UPS output.
Plug AC input power cord to
AC input correctly.
The icon
and the warning code
flashing on LCD display and
alarm is sounding every second.
EPO function is activated. Set the circuit in closed
position to disable EPO
function.
The icon and flashing on
LCD display and alarm is sounding
every second.
Line and neutral conductors
of UPS input are reversed.
Rotate mains power socket
by 180° and then connect to
UPS system.
The icon and flashing on
LCD display and alarm is sounding
every second.
The external or internal
battery is incorrectly
connected.
Check if all batteries are
connected well.
Fault code is shown as 27 and the
icon is lighting on LCD
display and alarm is continuously
sounding.
Battery voltage is too high
or the charger is fault.
Contact your dealer.
Fault code is shown as 28 and the
icon is lighting on LCD
display and alarm is continuously
sounding.
Battery voltage is too low or
the charger is fault.
Contact your dealer.
UPS is overload Remove excess loads from
UPS output.
UPS is overloaded. Devices
connected to the UPS are
fed directly by the electrical
network via the Bypass.
Remove excess loads from
UPS output.
The icon and is
flashing on LCD display and alarm
is sounding twice every second.
After repetitive overloads,
the UPS is locked in the
Bypass mode. Connected
devices are fed directly by
the mains.
Remove excess loads from
UPS output first. Then shut
down the UPS and restart it.
Fault code is shown as 43 and The
icon is lighting on LCD
display and alarm is continuously
sounding.
The UPS shut down
automatically because of
overload at the UPS output.
Remove excess loads from
UPS output and restart it.
16


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