Most jams clear with a hex wrench and your hands, not a plumber

A locked garbage disposal usually means something solid is wedged between the impellers and the chamber wall. The fix depends on whether the motor still hums when you flip the switch. If it hums but does not turn, the jam is mechanical and you can clear it yourself in ten minutes. If it does not hum at all, the motor may have tripped its overload switch, which you reset from underneath the unit.

Do not reach into the chamber with the power on. Do not use your fingers to pull out the object. A hex wrench (also called an Allen wrench) and a pair of pliers or tongs are your real tools here.

Key Takeaways

  • Turn off the wall switch and unplug the disposal before you touch anything inside the chamber.
  • Most disposals have a hex socket on the bottom that lets you manually turn the impellers back and forth to dislodge the jam.
  • If the motor hums but will not turn, the jam is stuck food or an object; if it does not hum, press the red reset button underneath the unit first.
  • Once the impellers move freely, remove the stuck object with pliers or tongs, never your fingers.
  • Run cold water and the disposal for a few seconds to confirm the jam is cleared before you walk away.

Locate the hex socket on the bottom of the unit

Flip the wall switch to off and unplug the disposal from the outlet underneath the sink. Look at the bottom center of the disposal housing. You will see a small hex-shaped hole, usually about the size of a quarter. This is the manual turn socket.

Insert the correct size hex wrench — most disposals use a 1/4-inch or 5/16-inch wrench — and turn it back and forth gently. Do not force it. You are trying to rock the impellers loose, not break the wrench. Turn a quarter turn in one direction, then a quarter turn back. Repeat five or six times.

As you work the wrench, you may feel the impellers shift. That is the jam breaking free. Once the wrench turns more freely through a full rotation, the jam has cleared enough to proceed.

Remove the stuck object with pliers or tongs

With the impellers now loose, look down into the chamber from above the sink. Use a flashlight if you cannot see clearly. You should now see what is blocking it — usually a bone, a piece of glass, a bottle cap, or a twist tie.

Reach in with needle-nose pliers or kitchen tongs and pull the object straight up and out. Do not twist or jab. If the object is still stuck, work the hex wrench another few times and try again. Once you have removed it, set it aside.

Shine the light into the chamber again and look for a second object. Jams sometimes have two pieces wedged together. If you see anything else, remove it the same way.

Reset the motor if it will not hum

If the disposal does not hum at all when you flip the switch, the motor's overload protector has shut it down. This is a safety feature that triggers when the motor gets too hot or works too hard against a jam.

Look underneath the unit for a red or black button protruding from the bottom or side of the motor housing. Press it firmly until it clicks. This resets the overload switch. Plug the disposal back in and flip the wall switch. The motor should now hum.

If it still does not hum after you reset it, the motor itself may be damaged and you will need a replacement unit. If it hums but still will not turn, go back to the hex wrench and work the impellers again — the jam is still there.

Test the disposal before you consider it fixed

Once the impellers turn freely and you have removed the stuck object, plug the disposal back in. Turn on the cold water at the sink and let it run for a few seconds. Flip the wall switch to on for just three to five seconds, then flip it back off. Listen and feel for any grinding or resistance.

If the impellers spin freely and you hear the normal grinding sound of food waste, the jam is cleared. Run the water for another ten seconds to flush any remaining debris down the drain. If you hear grinding or feel resistance, turn it off when ready and repeat the hex wrench steps — something else is still stuck.

When to call a plumber instead

If the hex wrench will not turn at all, even gently, something is jammed so tightly that forcing it risks breaking the wrench or damaging the impellers. Stop and call a plumber. The same applies if you reset the motor and it still will not hum — the motor itself has failed.

If you have cleared the jam, the impellers turn freely, but the disposal still will not run when plugged in, the electrical connection or the motor has a problem beyond a straightforward jam. A plumber or electrician can diagnose whether the unit is repairable or needs replacement.

Do not pour chemical drain cleaners into a jammed disposal. They will not clear a mechanical jam and they can damage the rubber seals inside the unit.

Prevent future jams with what you put down

Bones, fruit pits, shells, glass, and metal objects should go in the trash, not the disposal. Fibrous foods like celery, onion skins, and corn husks wrap around the impellers and cause jams. Grease and oil solidify in the drain and cause backups downstream.

Run cold water before, during, and after using the disposal. Cold water keeps grease solid so it grinds and flushes rather than coating the chamber. Hot water melts grease and lets it stick to the pipes.

Feed food into the disposal slowly and in small amounts. The unit is not designed to handle a full sink of scraps at once. A few handfuls at a time, with water running, is the right pace.

Frequently Asked Questions

Can I use a plunger to clear a jammed garbage disposal?

A plunger will not help with a mechanical jam inside the disposal chamber. The hex wrench method works because it moves the impellers themselves. A plunger only pushes water and air down the drain. If the jam is further down the drain line, a plunger might help, but first confirm the disposal chamber itself is clear.

What size hex wrench do I need?

Most disposals use a 1/4-inch or 5/16-inch hex wrench. Check your unit's manual or look at the socket itself to estimate the size. If you do not have the right size, a hardware store can sell you an individual wrench for a few dollars. Do not force a wrench that does not fit — you will strip the socket.

Is it safe to put my hand in the disposal to feel around?

No. Even with the power off, you risk cutting your fingers on the sharp impeller blades or on whatever is stuck in there. Use pliers or tongs instead. They give you reach and protection at the same time.

Why does my disposal jam every few weeks?

You are likely putting foods down it that should go in the trash — bones, fibrous vegetables, or shells. You may also be running it without enough water, which lets food stick to the chamber walls instead of flushing. Run water before, during, and after every use, and feed food in slowly.

Can I fix a disposal that leaks from the bottom?

A leak from the bottom usually means the motor seal has failed, which is not a jam problem. This requires replacing the entire unit. A leak from the sides where the disposal connects to the sink drain can sometimes be fixed by tightening the mounting bolts, but if it persists, the seal needs replacement.