
©2021 Lowell Manufacturing Co. UPS9AC-1000 (X-Rev 5/6/21)
11
Troubleshooting
If the UPS system does 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.
Ensure if input power cord is
firmly connected to the mains.
The AC input is connected to the
UPS output.
Plug AC input power cord to AC
input correctly.
The mains is normal but red LED is
flashing. The alarm is sounding every
second.
The internal battery connection is
wrong.
Please re-connect battery wires
with correct polarity.
The alarm is sounding twice every
second and red LED is flashing.
UPS is overloaded
Remove excess loads from UPS
output.
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.
The mains is normal. But the unit is on
battery mode.
Battery is not fully charged.
Please charge battery at least 5
hours. If battery is still in low
battery level, please contact local
dealer.
Battery defect.
Replace the battery with the same
type of battery.
Red LED is on and alarm is sounding
continuously.
UPS fault.
Please contact local dealer
directly.