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13. TROUBLESHOOTING/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.
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.
If you get an error code, check the connections and settings and/or replace the battery.
Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
Battery clamps do not
spark when touched
together.
The charger is equipped with an auto-
start feature. It will not supply current
to the battery clamps until a battery is
properly connected. The clamps will not
spark if touched together.
No problem; this is a normal condition.
The charger will not
turn on when properly
connected.
AC outlet is dead.
Poor electrical connection.
Battery is defective.
Check for open fuse or circuit breaker
supplying AC outlet.
Check power cord and extension cord
for loose fitting plug.
Have battery checked.
I cannot select a 6V or
12V setting.
The charger is equipped with Auto
Voltage Detection, which automatically
detects the voltage and charges the
battery.
No problem; this is normal.
The battery is correctly
connected, but the
Charging LED did not light
immediately.
If the START/STOP button is not
pressed, charging should begin in
thirty seconds.
No problem; this is normal.
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