If the disposal still only hums and water doesn’t drain. Foreign objects present on the machine. Garbage Disposal Humming But Not Jammed 2021 Solved When your garbage disposal is humming, it usually means that the motor is working, but the blades are not turning. Garbage disposal humming but not working when turned on . If you experience this problem, stop the garbage disposal right away! Stick a ¼ inch allen wrench into the hole at the bottom of the disposal (you’ll have to go under the sink). And most probably, you will find clogs in such cases. If the garbage disposal stays humming, then immediately turn it off. If your garbage disposal is still humming after you’ve unjammed it or manually rotated the grinding plate, there’s a good chance the disposer will need to be reset. If the garbage disposal humming sound is persistent when you turn it on, but the flywheel isn’t stuck, the likely reason for this is that the motor bearing has ceased. Climb under your sink ...