Make sure that the lid is closed properly and press the Start/Pause button. You can hear the locking sound to lock the lid in the beginning of the cycle. The washer will not operate unless the lid is locked.
Make sure that nothing is caught under the lid, including shipping material or clothing.
Make sure that the latch mechanism is fully retracted.
If the lid is closed and this error message is still displayed you will need to troubleshoot using a meter.
There are two styles of lock assemblies used in LG Top Load Washers. One style is the front control panel type and the other is the rear control panel style. Use the information in this article to identify the type you have and troubleshoot with the provided information.