The battery is defective
Replace.
When switched on, the
LED flashes red/yellow.
Charger and battery
voltage mismatch.
Connect the charger to a
battery(s) with the same
voltage rating.
When powered up the
LED is solid red with a
yellow flash.
The battery is very low,
and the charger is in a
slow charge phase, or
safe mode until the
voltage rises to a safe
level before full turn on.
Leave connected, it may
take hours, but if the
voltage rises even a little
bit, it should recover,
and turn the charger full
on.
(Do not allow your
batteries to deep
discharge, it is the
number one cause of
premature battery
failure
.)
The charger blows it’s
fuse, or branch circuit
fuse/circuit breaker as
soon as it’s switched on.
Charger is shorted.
Contact factory.
The charger blows the
branch circuit
fuse/circuit breaker a
short while after being
switched on.
The branch circuit is too
small.
Relocate charger to a
branch circuit with a
heavier rating, or
remove other loads on
the circuit.
Batteries use water, get
hot, or smell.
One or more dead cells.
Dip switch not set
correctly.
Replace batteries. If
charging in a series
string, it is best to
replace all the batteries
rather than mix new with
old.
If shallow discharging,
check that the dip switch
is not set to standard, or
extended cycle.
After a full charge, the
batteries die quickly
The batteries are bad.
Replace
