A humming garbage disposal is a sign that the unit is receiving power but the blades are not turning, either because they are jammed or the motor is faulty. One of these reasons includes a fried disposal. Solved Garbage Disposal Humming But Flywheel Isnt Stuck How To Fix It To fix a humming garbage disposal, turn off the power and unplug the unit. Why is my garbage disposal humming . When a garbage disposal starts making a humming noise, it’s usually a sign the blades are jammed or something is preventing them from rotating. The sound comes from its motor. If the unit is humming, this is an indication that power is flowing into the unit, but the blades are not able to turn. The humming sound can be a sign that the motor is clogged or jammed resulting in its failure to grind. Unfortunately, many homeowners use their garbage disposals to grind up chicken bones and skin, so it’s common for these items to. When the blades are jammed, they are unable to rotate. Scott e...