A garbage disposal humming sound occurs when electrical current is flowing into the motor windings, but the heavy steel flywheel and impellers are physically blocked from turning by hard food waste, a trapped foreign object like silverware, or internal corrosion. Because the motor is jammed, it cannot rotate, resulting in a loud hum and rapid overheating. Verification: Check if the motor shaft spins freely using a hex wrench inserted into the bottom motor socket.
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