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Troubleshooting
34 900-0112-01-00 Rev A
Error Messages
An Error message is caused by a critical fault. In most cases when this occurs, the unit will shut down
and the inverter’s ERROR LED (see page 11) will illuminate. See the system display manual for
instructions on viewing errors. One or more messages will display
yes
. If a message says
no
, it is not
the cause of the error.
Error screens can only display errors; they cannot clear them. It is possible to clear an error by
resetting the inverter. The inverter must be turned off, and then on, to reset it. Other possible
remedies are shown below (although it is still necessary to reset the inverter).
Table 5 Error Troubleshooting
Message Causes Possible Remedy
low ac output
voltage
Inverter’s AC regulation cannot be
maintained under high load conditions.
Check loads and measure current draw. Remove loads as
necessary.
stacking error
detected
Programming problem among stacked units.
(Often occurs if there is no master.) Can also
occur when
ac output backfeed
occurs.
Check stacking programming and designation of master.
(See page 24.)
Check for output backfeed from an external source.
Disconnect output if necessary.
inverter
overtemp
Inverter has exceeded its maximum allowed
operating temperature.
Shut off the inverter to reduce the temperature, or add
external cooling.
This can occur without shutting off the Sell feature. (It
turns off the inverter’s output, but not the input.) If an
extra inverter is added to the system, this will distribute
the sell current more widely and allow each unit to run
cooler.
low battery
voltage
DC voltage is below Low Battery Cut-Out
(LBCO) set point.
This error can be triggered by other causes. It
can appear along with
low AC output
voltage, AC output shorted
, or
ac output
backfeed
errors.
If this error accompanies other errors, treat those
conditions as appropriate.
If it occurs by itself: Recharge the batteries. The error will
clear automatically if an external AC source is connected
and the inverter’s charger comes on.
phase loss
error
A slave was ordered to transfer to AC by the
master, but no AC is present. The unit
continues inverting. Despite the name, this is
not accompanied by a shutdown.
Check the AC voltage on the inverter input terminals. If AC
voltage is not present, problem is external. If AC voltage is
present, the unit may be damaged. Contact OutBack
Technical Support (see inside front cover of this manual).
high battery
voltage
DC voltage exceeded acceptable level
(specified on page 13).
Check the charging source. This problem is usually the
result of external charging. This error will clear
automatically if conditions are removed.
ac output
shorted
Inverter exceeded its maximum surge current
due to severe overload.
Check the loads and wiring. This problem is more often
the result of a wiring error (a short).
ac output
backfeed
Usually indicates another AC power source
(out of phase with the inverter) was
connected to the unit’s AC output.
Disconnect the AC OUT wires from the inverter. Check the
wires (not the inverter) with an AC voltmeter. If an AC
source is present, shut it off.