A washing machine or dishwasher drain pump can stop working due to several common mechanical and electrical issues. The most frequent cause is physical blockage or clogs inside the pump impeller housing caused by accumulated lint, coins, hairpins, paper clips, or small clothing debris slipping past the drain basket filter. Other causes include electrical motor burnout from overheating, a jammed or broken impeller blade, a failing drain pump motor winding, or a malfunctioning electronic control board failing to send the necessary voltage signal to activate the pump during the final spin cycle. Regular filter maintenance prevents most clogs.
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