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Troubleshooting
900-0114-01-00 Rev A 35
Table 4 Basic Troubleshooting Steps
Symptom Unusual LEDs Possible Cause Possible Remedy
Unusual voltage
on AC HOT or
AC NEUTRAL
output line in
single-inverter
system.
None (Inverter LED is
illuminated)
System neutral and ground may not
be bonded.
Test AC HOT OUT and NEUTRAL OUT
connections on inverter’s terminals with
AC voltmeter. Test NEUTRAL OUT and
GROUND connections on inverter’s
terminals with AC voltmeter. The first
measurement should give full voltage;
the second measurement should give
zero. Any other result means the neutral
and ground are not bonded correctly.
Usually the hot line reads 60-75 Vac and
the neutral reads 45-60 Vac, with
respect to ground.
Unusual and
different
voltages on AC
HOT input or
output lines in
series stacked
system.
AC IN may flash Inverter neutral is not connected
correctly.
Test AC HOT and NEUTRAL connections
with AC voltmeter. (This can be on the
input or the output, depending where
the symptoms appear.) Test AC HOT
connections from one inverter to the
next. From hot to neutral should be
approximately 120 Vac. The two legs
should add up to 240 Vac. If the two
legs are different voltages but still add
up to 240 Vac, the neutral is not
connected to the inverter. Usually one
leg reads 100-110 Vac and the other
reads 130-140 Vac. If this problem is on
the input, the inverters may not connect
to the AC source.
Unit reads AC
input, even
though no
source is
present.
AC IN LED flashes Internal transfer relay may be
damaged.
Disconnect AC input wires and turn
inverter on. Test the AC HOT IN and
NEUTRAL IN connections with an AC
voltmeter. If voltage appears there,
transfer relay may be jammed. Contact
OutBack Technical Support (see inside
front cover of this manual).
Inverter output is being fed with an
external AC source that is out of
phase.
Disconnect AC output wires. Turn
inverter off and then on. If the problem
clears, reconnect the AC output wires. If
the problem recurs when reconnected,
an external AC source is connected to
the output.
Inverter hums
loudly. System
display may
show messages
for high battery
voltage,
low battery
voltage, or
backfeed error.
Error LED
Inverter has been incorrectly stacked
with another unit on the same
output. All units come defaulted as
master.
Check HUB ports and make certain the
master inverter is plugged into port 1.
MATE system display only: Check
stacking settings in the
ADV/FX/STACK
menu. Only one master is allowed per
system.