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Troubleshooting
900-0112-01-00 Rev B 37
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
in the MATE system display;
Y
in the MATE3. If a message says
no
(or
N
), 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 steps
are shown below (although it is still necessary to reset the inverter).
Table 5 Error Troubleshooting
Message
(MATE)
Message
(MATE3)
Causes Possible Remedy
low ac
output
voltage
Low 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
Stacking Error
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 25.)
Check for output backfeed from external
source. Disconnect output if necessary.
inverter
overtemp
Over
Temperature
Inverter has exceeded its maximum
allowed operating temperature.
Shut off the inverter to reduce the
temperature, or add external cooling.
low battery
voltage
Low Battery V
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
Phase Loss
A slave was ordered to transfer to AC by
the master, but no AC is present. The unit
continues inverting. This is the only
“Error” that 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
High Battery V
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
AC Output
Shorted
Inverter exceeded its maximum surge
current due to severe overload.
Check the loads and wiring. This issue is
usually the result of a wiring problem (a short),
as opposed to a poorly-sized load.
ac output
backfeed
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.