Schumacher Electric SC1319 Manual Del Usuario página 11

PROBLEM
The red LED is lit.
POSSIBLE CAUSE
The battery voltage is
still below 10V (for a 12V
battery) or 5V (for a 6V
battery) after 2 hours of
charging.
(or)
In maintain mode, the
output current is more than
1.5A for 12 hours.
Desulfation was
unsuccessful.
Lack of progress is detected
and battery voltage is below
14.2V (for a 12V battery)
or 7.1V (for a 6V battery).
The battery's initial voltage
is below 12.2V (for a 12V
battery) or 6.1V (for a 6V
battery) and the total input
is less than 1.5 Ah.
The battery voltage drops
to below 12.2V (for a 12V
battery) or 6.1V (for a 6V
battery) in Maintain Mode.
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SOLUTION
The battery may be
defective. 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 battery may be
defective. Have battery
checked or replaced.
The battery may be
overheated. If so, allow the
battery to cool. The battery
may be too large or have a
short circuit. Have battery
checked or replaced.
The battery capacity is too
low, or the battery is too
old. Have it checked or
replaced.
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.