LG · Laundry · WM4000HBA · Owner's Manual
Common causes are putting detergent in the wrong compartment, not closing the dispenser drawer fully, using too much detergent, low water supply, or normal residue buildup in the dispenser.
Source: LG WM4000HBA Owner's Manual, extracted pages 46-48
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Using Detergent, Bleach, and Other Laundry Products
This washer uses an automatic dispenser drawer for many laundry products, but some products must go directly into the drum. For best results, use the correct compartment and do not overfill.
Before you add anything - Always use HE (High-Efficiency) detergent with this washer. - Follow the detergent, bleach, and softener manufacturer’s recommendations. - Use less detergent for soft water, light soil, or smaller loads. - Be extra careful with 2X and 3X concentrated detergents. Even a small extra amount can cause problems. - Never use more than the maximum amount recommended by the manufacturer. - Do not place or store detergent, bleach, or liquid fabric softener on top of the washer. These products can damage the finish and controls.
LG WM4000HBA Owner's Manual, extracted pages 21-22Operation Problems: Leaks, Detergent Dispensing, Filling, and Cycle Behavior
This section helps you troubleshoot common washer problems such as leaks, detergent not dispensing correctly, filling issues, pauses during a cycle, and the washer stopping or not starting.
Banging noise when the washer is filling with water
LG WM4000HBA Owner's Manual, extracted pages 46-48This answer is only published when it has a reviewed answer status and a source citation back to the manual text.