When a washing machine motor hums, buzzes, or makes grinding noises during a wash cycle but the central agitator or inner drum refuses to move, it indicates a mechanical drivetrain failure. Frequent culprits include a snapped or slipping drive belt, worn-out plastic transmission gears, or a stripped agitator coupling that spins around the drive shaft without transferring torque. To diagnose this safely, unplug the appliance, remove the rear service panel, and inspect the lower motor pulleys.
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