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• 13 •
13. ERROR CODES AND TROUBLESHOOTING
Error Codes
CODE DESCRIPTION REASON/SOLUTION
F 01
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.
If you get an error code, check the connections and settings and/or replace the battery.
Troubleshooting
PROBLEM POSSIBLE CAUSE SOLUTION
No reading or 0.0V
shown on the display.
Clamps are not making a
good connection.
AC cord and/or extension
cord is loose.
No power at receptacle.
Clamp polarity reversed.
Check for poor connection at
battery and frame. Make sure
connecting points are clean.
Check power cord and extension
cord for loose tting plug.
Check for open fuse or circuit
breaker supplying AC outlet.
Verify and reverse the battery
clamps.
The
Boost/Charging
LED does not turn off.
The charger is still in Boost
mode.
The charger is still in one of
the charge modes.
This is normal. In Boost mode, the
LED will not turn off until the
battery is disconnected from the
charger.
This is normal. In one of the charge
modes, the LED will not turn off
until the battery charging process
is completed.
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