The 'LE' error message indicates the control board has detected that the
motor is either not turning, or has locked up for some reason.
Monitoring the motor is the job of the hall effect sensor board which
constantly determines the direction and speed of the motor and feeds
that information back to the control board. If there is a problem
between what the motor should be doing and what the hall effect sensor
says the motor is doing, the 'LE' will be displayed and the cycle will
Motor lock can be caused by several things from a
loose connector, to a bad motor, or even the hall effect sensor failing
or dislodging from it's mount. Any one or more of these components could
have caused this error, but it is possible to separate the working from
the non-working, just by following a process. The reason this
particular unit has been on the injured list for so long is the first
tech never followed a trouble shooting process to ensure the parts being
replaced had actually failed.
Fig. 01: LG front load motor circuit
It sounds like there is a problem with the hall effect sensor board as
it sounds like you have replaced the rest of the components. Get to the
main board, look for the hall sensor connector which should be a white
connector with white, blue, red, and gray wires. Use a multimeter to
measure between the white and gray with power on. You should read
10-15vdc, if not the board is bad. Then measure between the blue and
gray wires while slowly rotating the motor. You should see a pulsing
10vdc and the same thing if you measure betwen red and gray. If you
don't measure anything, then the wiring needs to be checked for an open
circuit. If you measure less than 10vdc, or the voltage does not pulse
as you rotate the motor, the sensor board is bad. You can also verify
the wiring to the motor by measuring between any two wires on the red
motor connector with blue, red, and yellow wires. You should read
between 5 and 15 ohms between any two wires. If you measure an open
circuit on any of them, then time to check the wiring harness for a
broken wire, or a loose connection on either end.
The part number for the Hall Sensor
and it is the most likely cause of your problem.
To search this and other replacement parts, visit this link appliancepartspros.com
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