A garbage disposal that hums but won’t spin is jammed, not dead — and that’s good news, because it’s usually a 60-second fix. The hum means the motor is getting power but something is wedged against the flywheel. The one thing you have to do first: shut it off. Let it hum and the motor will overheat and trip (or burn out).
This is different from a disposal that’s completely silent — if yours makes no sound at all, start with our garbage disposal not working guide instead. A hum means power is fine; you just have a jam.
The 60-Second Unjam
1. Turn it off at the switch. Don’t keep flipping it on hoping it frees itself — that overheats the motor.
2. Free the flywheel from the bottom. Look under the sink at the bottom of the disposal for a hex (Allen) socket in the center. Insert the 1/4″ hex wrench that came with the unit (or any matching Allen key) and crank it back and forth a few times. You’ll feel the jam break loose.
3. Or turn it from the top. No wrench? Kill the power, then put the handle of a wooden spoon down into the disposal against one of the impeller lugs and lever it around until it spins freely. Never use your hand.
4. Fish out the debris. With the power still off, use tongs or pliers to remove whatever caused the jam — usually a bone, a fruit pit, a bottle cap, or a chunk of silverware.
5. Hit the reset button. On the bottom of the unit, press the small red overload button back in if it popped. Give the motor a few minutes to cool first.
6. Run cold water and test. Turn the water on, then flip the switch. It should grind normally.
If It Still Won’t Spin
If it hums after you’ve cleared the jam and pressed reset, the bearings or motor may be shot — at that point a replacement is cheaper than a repair. A solid 3/4 HP unit handles tougher scraps without jamming in the first place; see our best garbage disposals picks and the cost to replace a garbage disposal. Swapping one yourself is a 30-minute job on the standard 3-bolt mount.
Prevent the next jam: no bones, fruit pits, fibrous peels, or grease, and always run cold water before, during, and a few seconds after. For other clogs downstream, see how to unclog a drain.
Frequently Asked Questions
Why is my garbage disposal humming but not spinning?
A hum with no grinding means the motor has power but the flywheel is jammed — usually a bone, fruit pit, or piece of metal stuck against the impeller. Turn it off immediately so the motor doesn’t overheat, then free the jam with the hex wrench.
Where is the reset button on a garbage disposal?
On the bottom of the unit, under the sink. It is a small red (sometimes black) button. If it has popped out, the motor tripped its overload — clear any jam first, let it cool a few minutes, then press the button back in.
Can I put my hand in the garbage disposal?
Never — not even when it is off. Always use the hex wrench in the bottom socket or a wooden spoon handle from above to turn or free the flywheel. The cutters are sharp and the unit can be switched on accidentally.
Fix the 12 Most Common Plumbing Problems Yourself — Free Plumber’s Handbook — including the clog fixes that save a $200 drain call
Step-by-step fixes for the 12 most common problems — and exactly when to call a pro. Free and instant, from a licensed plumber. Save hundreds on calls you didn’t need.