Schumacher Electric SF-51A-PE Guide D'utilisation page 6

The battery charger is designed to work automatically. However, If a problem does occur, check the following:
PROBLEM
No meter reading.
Charger will not turn on when
properly connected to power.
Charger will not turn OFF.
Meter needle pulses (fluctuates)
every few seconds AFTER THREE
HOURS without slowing down.
Charging current is less than full
output rating of charger.
Meter needle moves to extreme
right, remains a short time, then
returns to zero, accompanied by a
clicking sound.
TROUBLESHOOTING
POSSIBLE
Charger is not plugged in
Connections are reversed.
Poor electrical connection.
AC outlet is dead.
Battery is defective (will not accept
charge).
Battery recently used in vehicle and is
fully charged.
Battery has problem and will not take
full charge.
Two or more batteries connected in
parallel.
Battery of 200 ampere hours or larger.
Battery is connected to application that
draws a small current (such as an auto
dome light).
Battery is partially charged.
Battery is defective (battery plates are
crusted) and will not accept a full
charge.
AC power supply is low.
Severely discharged battery (but
otherwise good battery).
In MANUAL with battery connections
reversed.
Battery is defective (will not accept
charge)
Charger is cycling after circuit breaking
overload.
6
SOLUTION
Plug in
With charger unplugged, reverse clips and
reconnect (rock back and forth to bite in).
Clean clamps and battery poles and reconnect
(roll back and forth to bite in).
Plug in a lamp or other appliance to check for
voltage.
Have battery checked.
Battery does not need changing.
(If battery is in vehicle turning on headlights
will lower battery voltage in a few seconds and
charger should then turn on.)
Battery has less than .7 volts set to manual and
retry.
Have battery checked.
(If in MANUAL, switch to AUTOMATIC).
Requires more time to charge: continue
charging.
Requires more time to charge: continue
charging.
Continue charging.
Have checked and replace battery.
Plug charger into another grounded AC outlet.
Allow charging to continue until battery has
recovered sufficiently to take a charge (Circuit
breaker will continue to cycle and needle will
swing side to side until battery has recovered).
Unplug charger and change to correct
connections.
Have battery checked.
Wait until charger automatically resets itself
(DO NOT RETURN FOR SERVICE).