I am getting error code LF despite checking the water lines for kinks or blockage. The water flows freely from the source in the wall. It is not a water issue. Please advise.

You need to replace the water inlet valve on the washer. The valve you need for the model you gave is linked below.

https://prismparts.com/products/whirlpool-washer-water-inlet-valve-assembly-pp4459236?_pos=2&_sid=286c7190f&_ss=r