A washing machine or dishwasher drain pump fails primarily due to physical mechanical obstruction, motor wear, and electrical overheating. Over time, debris such as coins, bobby pins, paper clips, and heavy lint bypasses the tub filter and jams the pump impeller, forcing the electric motor to strain and overheat against resistance. Furthermore, continuous exposure to moisture and soapy water can degrade internal shaft seals, allowing water to leak into the motor housing and cause electrical short circuits, rust, and permanent motor burnout. Regular cleaning of the drain filter extends pump longevity significantly.
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