A garbage disposal humming sound indicates that electrical current is flowing successfully into the motor windings, but the heavy steel flywheel and impellers are physically blocked from turning by hard food waste, bone fragments, a trapped foreign object like silverware, or internal corrosion. Because the motor is jammed and unable to rotate, it stalls and generates a loud hum while rapidly overheating. Verification: Check whether the motor shaft spins freely using a hex wrench inserted into the bottom motor housing socket.
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