Some info here:
http://www.fixya.com/support/t1696432-lg_tromm_clothes_washer_le_error_code
Check for mechanical damage to wiring:
https://www.youtube.com/watch?v=fKA3MGOLMHE
One very useful looking page with a step by step analysis. In the end, it looks like you have to be very careful to install the Hall effect sensor corrrectly. Read the whole thread.
http://fixitnow.com/wp/2010/08/03/the-dreaded-le-error-code-in-lg-washing-machines-diagnosis-troubleshooting-root-causes-and-repair/
XX
March 2015