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13. TROUBLESHOOTING AND ERROR CODES
Error Codes
CODE
DESCRIPTION
REASON/SOLUTION
F01
The battery voltage is still under 10V
(for a 12V battery) or 5V (for a 6V
battery) after 2 hours of charging.
The battery could be bad. Have it checked or replaced.
SUL
The charger has detected a sulfated
battery.
The charger will go into desulfation mode. If the
desulfation is not successful after 10 hours, the charger
will go into abort mode.
F02
The charger cannot desulfate the
battery.
The battery could not be desulfated; have it checked or
replaced.
F03
The battery was unable to reach the
“full charge” voltage.
May be caused by trying to charge a large battery or bank of
batteries on too low of a current setting. Try again with a higher
current setting or have the battery checked or replaced.
F04
The connections to the battery are
reversed.
The battery is connected backwards. Unplug the charger and
reverse the connections to the battery.
F05
The charger was unable to keep
the battery fully charged in maintain
mode.
The battery won’t hold a charge. May be caused by a drain on
the battery or the battery could be bad. Make sure there are
no loads on the battery. If there are, remove them. If there are
none, have the battery checked or replaced.
F06
The charger detected that the
battery may be getting too hot
(thermal runaway).
The charger automatically shuts the current off if it detects
the battery may be getting too hot. Have the battery
checked or replaced.
F07
The charger shut off because its
internal temperature exceeds limit.
Make sure the charger does not have the side ventilation
holes blocked. Move the charger out of the sun and into
the shade.
F08
The battery voltage dropped too low
during the maintain mode.
May be caused by a drain on the battery or the battery
could be bad. Make sure there are no loads on the
battery. If there are, remove them. If there are none, have
the battery checked or replaced.
If you get an error code, check the connections and settings and/or replace the battery.
