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17
4. Troubleshooting
If Commander RT series do not operate correctly, please solve the problem by using the table
below.
Symptom
Possible cause
Remedy
No indication and alarm even
though the mains is normal.
The AC input power is not
connected well.
Check if input power cord
firmly connected to the
mains.
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 2 short
beeps every 2 seconds
EPO function is activated.
Set the circuit in close
position to disable EPO
function.
The icon
and
flashing on
LCD display and alarm is sounding
2 short beeps every 2 seconds
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 2 short beeps every 2
seconds
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.
The icon
and the icon
are flashing on LCD
display and alarm is sounding 2
short beeps every 2 seconds.
UPS is overload
Remove excess loads from
UPS output.
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.
Fault code is shown as 14 and
alarm is continuously sounding.
The UPS shut down
automatically because short
circuit occurs on the UPS
output.
Check output wiring and if
connected devices are in
short circuit status.
