You can determine that a garbage disposal motor is permanently burned out if pressing the reset button does not restore power, flipping the wall switch causes a burning electrical smell or smoke, and the unit trips the main circuit breaker instantly. Furthermore, if the motor shaft spins freely when manually turned with a hex wrench but produces zero sound or humming when plugged into a verified live electrical outlet, the internal motor windings have failed completely. Verification: Test electrical continuity across the motor terminals using a digital multimeter.
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