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Troubleshooting
900-0112-01-00 Rev A 33
Table 4 Basic Troubleshooting Steps
Symptom Unusual LEDs Possible Cause Possible Remedy
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.