When a garbage disposal hums loudly but the motor fails to spin, it almost always indicates a jammed flywheel caused by hard food waste, a trapped foreign object (like a bone or piece of silverware), or corrosion locking the impellers in place. The humming sound occurs because electrical current is flowing into the motor windings, but the motor is physically blocked from turning. Callout type="warning" title="Safety Warning": Never put your hand inside the disposal drain. Verification: Insert a hex wrench (allen wrench) into the manual socket on the bottom of the motor housing and rotate it back and forth to clear the jam.
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