A garbage disposal that hums when you flip the switch but doesn’t spin is one of the most common kitchen calls we get — and the good news is it’s often a quick, safe fix. That hum means the motor is getting power; something is just stopping the blades from turning.
What the hum actually means
A humming disposal almost always points to one of two things: the flywheel (the spinning plate the blades are mounted to) is physically stuck, or the motor has overheated and shut itself down as a safety measure. Either way, the motor itself is usually fine — which is why this is often fixable without a replacement.
If it’s overheated
- ▸Turn off the power to the disposal at the switch and at the breaker
- ▸Let it cool for 10–15 minutes
- ▸Look for the small red reset button on the bottom of the unit
- ▸Press it firmly — you should feel or hear a click
- ▸Restore power and try it again
If it’s jammed
A jam is usually caused by something that shouldn’t have gone down the drain — a utensil, a fruit pit, fibrous food scraps, or a buildup of grease and debris on the shredding plate.
- ▸Turn off power at the switch AND the breaker — this step is not optional
- ▸Most disposals have a hex-shaped hole at the bottom center for a manual crank wrench (often included with the unit)
- ▸Insert the wrench and turn it firmly in both directions to free the flywheel
- ▸Once it turns freely, restore power and test it
Never do this
Never put your hand into the disposal, even with the power off. If you don’t have the manual crank wrench, or the flywheel won’t budge, stop and call a plumber rather than reaching inside with a tool.
When it’s not a jam or overheating
If the reset button and manual crank don’t solve it, the issue may be electrical — a tripped breaker, a loose connection, or a failing switch — or the motor bearing may have seized for good. A seized motor bearing generally means the unit needs to be replaced rather than repaired.
See our garbage disposal services →Preventing the next jam
- ▸Run cold water before, during, and after each use
- ▸Avoid fibrous foods like celery, corn husks, and onion skins
- ▸Never pour grease down the disposal — it hardens and coats the blades
- ▸Grind ice occasionally to help clean the blades
Frequently Asked Questions
Why does my garbage disposal hum but not spin?
A hum with no spinning almost always means the flywheel is jammed or the motor has overheated and tripped its internal safety switch. Both are usually fixable — try the reset button after letting it cool, or free the flywheel with a manual crank wrench.
Where is the reset button on a garbage disposal?
It’s a small red button on the bottom of the unit, underneath the sink. Press it firmly after the disposal has cooled for 10–15 minutes; you should feel or hear a click.
Is it safe to fix a jammed disposal myself?
Yes, as long as you fully cut power at the switch and the breaker first, and use the manual crank wrench rather than your hand. If it won’t free up or you don’t have the wrench, call a plumber rather than reaching inside.