A garbage disposal humming without rotating means the electric motor is receiving power, but the heavy internal flywheel is jammed and locked in place by debris, bone fragments, or foreign metal objects. When the flywheel cannot spin, the motor stalls and generates a humming noise. Callout type="warning" title="Safety Warning": Never put your hand inside the drain. Verification: Insert a hex wrench into the bottom motor socket and rotate it manually to clear the obstruction.
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