The LG Model LG Washer model WM2487HRMA
ISSUE: Washing Machine was filling very slowly. Overnight it would fill about 1 or 2 gallons. I would clear the tub by pushing a) Power b) set spin to None c) push Start. That would empty the tub.
REPAIR SOLUTION: That did not solve the problem.
Second, I replaced both the single (1) Water inlet valve assembly
Part Number:5220FR2006H
and also the Water Level pressure switch Part Number:6601ER1006E
That solved the problem. I can't tell you which item was the problem. The Water Inlet Valve assembly was missing an orange cap. So most likely was the issue.
The install is easy and quick. about 45 min. of work.
Notes; When you replace the Water Level Pressure Switch, make sure to drain the hose in the front drain cover, so the level is set to zero level.