Garbage disposal not working: how to reset and fix it
By Daniel Brooks, Home maintenance writer and appliance troubleshooting specialist based in Charlotte, NC. Reviewed [date — human adds].
Quick answer
Most disposals that hum, or go completely silent, are fixed by the reset button on the unit's underside or by clearing a jam manually. A full replacement is rarely the first answer. Work through the steps below in order before assuming the motor has failed, whether your disposal has stopped working outright or simply won't turn on at all.
⚠
Safety first: never put your hand inside the disposal
This is the one non-negotiable rule on this page. Always turn off the wall switch and cut power at the breaker, or unplug the unit if it's on an accessible cord under the sink, before reaching into the disposal chamber for any reason. Use a disposal wrench, a hex key in the bottom port, or a broom handle wedged against a blade to clear a jam, never your fingers, even with the switch off. A disposal can restart unexpectedly if a wall switch gets bumped, if a timer setting is active, or if someone else in the house flips it back on without knowing you're working underneath it.
Work through it in order
Start with the reset button. It resolves the majority of dead-disposal cases in under a minute, long before anything more involved is worth trying.
1
Press the reset button
Look for a small red button on the underside of the unit, reachable from under the sink. It trips automatically when the motor overheats or overloads, working much like a circuit breaker built into the disposal itself, and pressing it back in is the single most common fix for a disposal that's gone silent or won't turn on. If it doesn't stay in, or pops right back out, that usually means the motor is still under load from a jam, so move on to step 2.
2
Clear a jam if the disposal hums but doesn't spin
A hum without any spinning almost always means the flywheel inside is jammed, usually by a stuck utensil, a fruit pit, or a fibrous piece of food. With the power off at both the wall switch and the breaker, insert a hex key into the bottom port most residential models have specifically for this, or use a wooden spoon handle from the top to rock the flywheel free in both directions. Once it turns freely by hand, restore power and try the reset button again.
3
Check for no power at all
If there's no sound, no light, and no hum whatsoever, and the disposal isn't turning on at all, confirm the wall switch is actually on, check that the unit is plugged in under the sink if it uses a cord, and check the breaker. Many homes wire the disposal to its own dedicated circuit, which can trip without affecting anything else in the kitchen, so a working overhead light doesn't rule this out.
4
Consider motor failure
If reset and jam-clearing don't resolve it and there's still no response at all, the motor itself has likely failed. On an older unit, this typically means replacement rather than repair, since motor rebuilds aren't common or cost-effective on residential disposals.
Before you call for service, a few things worth trying first
Run cold water while operating the disposal. It helps flush debris through and keeps the motor from overheating during longer grinding jobs. Avoid overloading it with fibrous scraps like celery, corn husks, or onion skins, some of the more common jam-causers, and run it in short bursts rather than trying to grind a full sink's worth of scraps in one go.
When any of this points to a technician instead
Call a plumber or appliance technician if the motor won't restart after a confirmed jam clear and reset, if there's a burning smell at any point, or if the unit trips the breaker repeatedly even when it's empty and unjammed. A disposal that's also leaking is a separate situation, worth checking against a disposal that's also leaking rather than assuming it's the same motor problem, since a leak paired with a stalled motor usually points to an internal seal failure rather than something a reset will fix. And if the disposal runs fine but the sink itself won't clear, that's running but not draining properly instead, a downstream plumbing issue rather than anything wrong with the disposal.
Photos for this guide
Real photo of the underside of a garbage disposal showing the reset button.
PHOTO — human adds
Real photo of a hex key inserted into a disposal's bottom port.
FAQ
Where is the reset button on a garbage disposal?
On most residential units, it's a small red button on the underside of the disposal, reachable from under the sink. Pressing it resets an internal circuit breaker that trips automatically when the motor overheats or overloads, and it's the first thing worth checking on a disposal that's gone silent.
My disposal hums but won't spin. What does that mean?
A hum without spinning almost always means the flywheel inside is jammed, usually by a stuck food fragment or a utensil that fell in, rather than a failed motor. With the power off at the switch and the breaker, most units can be freed with a hex key in the bottom port or by rocking the flywheel from the top with a blunt tool.
Is it safe to reach into a garbage disposal to clear a jam?
No, never with your hand, even with the power switch off. Disconnect power at the breaker as well, and use a hex key, a disposal wrench, or a long-handled tool instead. Disposals can restart unexpectedly if a switch is bumped or a timer setting is active.
How do I know if my disposal needs to be replaced instead of reset?
If the reset button trips repeatedly even on an empty, unjammed unit, or there's no response at all after confirming power and clearing any jam, the motor has likely failed. Disposals typically last 8 to 15 years, and a dead motor on a unit at or past that range is usually more cost-effective to replace than repair.
