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Troubleshooting Reference
23
Troubleshooting Reference
Problem Possible Cause Solution
Low output voltage
(96 Vac–104 Vac)
You are using a
voltmeter that cannot
accurately read the
RMS voltage of a
modified sine wave.
Use a true RMS reading
voltmeter.
Load runs for a few
seconds and then
FAULT
indicator lights.
Overload Reduce the load.
No output voltage, alarm
sounding, and
FAULT
indicator on.
Low input voltage Recharge battery; check
connections and cable.
No output voltage;
neither indicator on.
The inverter is off.
No power to the
inverter.
Inverter fuse open.
Reverse DC polarity.
Turn the inverter on.
Check wiring to inverter.
Have a qualified technician
check and replace the fuse
if necessary.
Have a service technician
check and replace the fuse,
making sure to observe
correct polarity.
No output voltage and
FAULT
indicator is on.
High input voltage. Make sure the PROwatt is
connected to a 12 V battery.
Check voltage regulation of
the charging system.
Low battery alarm stays
on; load ran for short
time.
Poor DC wiring; poor
battery condition.
Use proper cable and make
solid connections. Install a
new battery.
No output voltage;
FAULT
indicator on;
load exceeds 600 W/5 A
output. Unit hot to touch.
Thermal shutdown. Allow the unit to cool off.
Reduce the load if
continuous operation is
required.
Improve ventilation. Make
sure ventilation openings
are not obstructed. Reduce
ambient temperature.
No output voltage and
FAULT
indicator is on.
Short circuit.
Very high power load.
Check AC wiring for short
circuit.
Remove the load.