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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.
