Troubleshooting - Mustek PowerMust 1008 User Manual

4. Troubleshooting

If the UPS system does not operate correctly, please solve the problem by using the table below.
Symptom
No indication and alarm even
though the mains is normal.
The icon and the warning code
flashing on LCD display and
alarm is sounding every second.
The icon and
LCD display and alarm is sounding
every second.
The icon and
LCD display and alarm is sounding
every second.
Fault code is shown as 27 and the
icon is lighting on LCD
display and alarm is continuously
sounding.
Fault code is shown as 28 and the
icon is lighting on LCD
display and alarm is continuously
sounding.
The icon and
flashing on LCD display and alarm
is sounding twice every second.
Fault code is shown as 43 and The
icon is lighting on LCD
display and alarm is continuously
sounding.
The AC input power is not
connected well.
The AC input is connected
to the UPS output.
EPO function is activated.
Line and neutral conductors
flashing on
of UPS input are reversed.
The external or internal
flashing on
battery is incorrectly
connected.
Battery voltage is too high
or the charger is fault.
Battery voltage is too low or
the charger is fault.
UPS is overload
is
UPS is overloaded. Devices
connected to the UPS are
fed directly by the electrical
network via the Bypass.
After repetitive overloads,
the UPS is locked in the
Bypass mode. Connected
devices are fed directly by
the mains.
The UPS shut down
automatically because of
overload at the UPS output.
Possible cause
15
Remedy
Check if input power cord
firmly connected to the
mains.
Plug AC input power cord to
AC input correctly.
Set the circuit in closed
position to disable EPO
function.
Rotate mains power socket
by 180° and then connect to
UPS system.
Check if all batteries are
connected well.
Contact your dealer.
Contact your dealer.
Remove excess loads from
UPS output.
Remove excess loads from
UPS output.
Remove excess loads from
UPS output first. Then shut
down the UPS and restart it.
Remove excess loads from
UPS output and restart it.