LG · Laundry · WM4000HBA · Owner's Manual

How do I clean the LG WM4000HBA drain pump filter?

Turn the washer off, drain remaining water through the drain hose, remove debris from the drain pump filter, reinstall it securely, and run a test cycle. This answer is grounded in the manual's drain pump filter maintenance section.

Source: LG WM4000HBA Owner's Manual, pages 48-49