A garbage disposal can stop working due to several common electrical and mechanical malfunctions. Primary culprits include a tripped thermal overload protector button on the bottom of the unit caused by motor overheating, a jammed flywheel locked up by hard bones or utensils causing a humming sound, a tripped under-sink GFCI electrical outlet, or a burned-out motor winding from age. Additionally, a jammed disposal can trip your kitchen's main electrical circuit breaker. Verification: Check the reset button, test electrical outlets, and inspect for jams using a hex wrench.
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