Jean L Bethpage , NY June 13, 2015 Appliance: LG Washer WM1812CW Lg Washer Wm1812cw: The lg tromm washer kept displaying the le error code upon starting. How to replace Washer Rotor Position Sensor Assembly. I followed the instructions from the video and replacing the Rotor Position Sensor Switch. All is well now - the washer is functioning back to normal. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes