Troubleshooting And Error Codes - Napa 90-620 Owner's Manual

13. TROUBLESHOOTING AND ERROR CODES

Error Codes
CODE
The battery voltage is still under 10V
F01 (for a 12V battery) or 5V (for a 6V
battery) after 2 hours of charging.
The charger has detected a sulfated
SUL battery.
The charger cannot desulfate the
F02
battery.
The battery was unable to reach the
"full charge" voltage.
F03
The connections to the battery are
F04
reversed.
The charger was unable to keep
the battery fully charged in maintain
F05
mode.
The charger detected that the battery
F06 may be getting too hot (thermal
runaway).
The charger shut off because its
F07 internal temperature exceeds limit.
The battery voltage dropped too low
during the maintain mode.
F08
If you get an error code, check the connections and settings and/or replace the battery.
DESCRIPTION REASON/SOLUTION
The battery could be bad. Have it checked or replaced.
The charger will go into desulfation mode. If the
desulfation is not successful after 10 hours, the charger
will go into abort mode.
The battery could not be desulfated; have it checked or
replaced.
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.
The battery is connected backwards. Unplug the charger
and reverse the connections to the battery.
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.
The charger automatically shuts the current off if it
detects the battery may be getting too hot. Have the
battery checked or replaced.
Make sure the charger does not have the side ventilation
holes blocked. Move the charger out of the sun and into
the shade.
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.
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