Start with the power and the reset button
A garbage disposal that will not run usually stops because the circuit breaker tripped, the outlet lost power, or the unit's internal reset button popped. Check these three things first, in order, before you assume the disposal itself is broken.
Look under your sink at the outlet where the disposal plugs in. If it is a GFCI outlet (the kind with two buttons in the middle), press the black "Reset" button. If that does not work, go to your home's electrical panel and look for a breaker labeled "Kitchen" or "Disposal." Flip it all the way off, then back on. If the breaker trips again when ready when you turn the disposal on, stop and move to the section on jam clearing — something is stuck.
If the outlet is not a GFCI, plug a lamp or phone charger into it to confirm the outlet itself has power. If the outlet is dead but other outlets in the kitchen work, that outlet may be on a tripped breaker or a bad wire. If the disposal still will not start after power is confirmed, locate the reset button on the bottom or side of the disposal unit itself (a small red or black button) and press it firmly. Wait a few seconds and try the switch again.
Key Takeaways
- Most disposals stop running because a circuit breaker tripped or the reset button activated, not because the motor failed.
- Check the outlet with another device, reset the GFCI if present, and flip the breaker off and back on before assuming the unit is broken.
- If the breaker trips the moment you turn on the disposal, something is jammed and you must clear it before the motor will run.
- Never reach into the disposal with your hands; use tongs or pliers to remove visible debris, and run water while the unit is off.
- If the motor hums but the blades do not spin, the jam is severe enough to lock the impellers and you may need a professional.
Clear a jam without reaching inside
If the breaker trips when you flip the switch, or if you hear the motor hum but the blades do not spin, something is wedged between the impellers. Do not put your hand in the disposal. Turn off the power at the breaker and leave it off while you work.
Fill the sink with a few inches of water so you can see into the disposal opening. Use a flashlight to look down and spot what is stuck. Common culprits are bones, fruit pits, fibrous vegetable peels, glass, or utensils. If you can see it, use needle-nose pliers or kitchen tongs to pull it straight up and out. Work slowly — forcing it can break the pliers or push the object deeper.
Once you have removed the visible jam, turn the power back on at the breaker and run cold water into the disposal for 10 to 15 seconds without turning on the switch. This clears loose debris. Then flip the switch on for 3 to 5 seconds while water runs, and off again. Repeat this cycle two or three times. If the motor still hums without the blades turning, the jam is too tight for a home fix and you should call a plumber.
Run water and use the right technique
A disposal that starts but drains slowly or smells bad often works fine mechanically but needs better operating habits. Always run cold water before, during, and after using the disposal. Cold water keeps grease solid so it breaks into smaller pieces rather than coating the pipes.
Turn on the water first, then flip the disposal switch. Let it run for 5 to 10 seconds after the food is gone, then turn off the switch and let the water run for another 5 seconds. This flushes the ground food down the drain instead of leaving it in the chamber. Never put the disposal on and then drop food in — the water needs to be moving first.
Avoid putting fibrous foods like celery, corn husks, onion skins, or potato peels down the disposal. These wrap around the impellers and jam the unit. Grease, oil, and fat should never go in — they solidify in the pipes downstream and cause clogs. Bones, pits, shells, and glass will damage the impellers or jam them solid.
Clean the disposal if it drains slowly or smells
If the disposal runs but water backs up into the sink, or if it smells like old food, the chamber is clogged with buildup. You do not need to take it apart. Fill the sink halfway with water, plug the drain opening with a wet cloth, and turn on the disposal. The pressure and turbulence will dislodge stuck food and grease. Do this once a week if you use the disposal daily.
For odor, cut a lemon or lime in half and run it through the disposal with cold water running. The citric acid breaks down buildup and kills odor-causing bacteria. Ice cubes also work — run a handful through with water to scour the chamber walls. Do not use bleach or drain cleaner in a disposal; these can damage the rubber seal and the motor.
If the sink still drains slowly after cleaning the disposal, the clog is in the drain pipe below, not in the disposal itself. You will need a plunger or a drain snake to clear the pipe.
Test the switch and outlet if the disposal will not turn on
If power is confirmed and the reset button is pressed, but the disposal still will not start, the wall switch may be broken. Turn off the breaker, unplug the disposal, and plug a lamp into the outlet. Flip the switch. If the lamp turns on and off, the switch works and the problem is the disposal motor or cord. If the lamp does not respond to the switch, the switch is bad and needs replacement.
A broken switch is a straightforward fix — you can buy a replacement at any hardware store for under $20 and swap it yourself if you are comfortable with basic wiring. Turn off the breaker, remove the old switch from the wall box, disconnect the wires (take a photo first so you remember which wire goes where), and connect them to the new switch in the same order. If you are not confident doing this, a electrician can replace it in under an hour.
When to call a plumber
Call a plumber if the motor hums loudly but the blades do not turn, even after you have cleared all visible jams. This means the impellers are locked and the motor is straining. Continuing to run it will burn out the motor. A plumber can sometimes free the jam from below the unit, or they can replace the disposal if the motor is already damaged.
Also call a plumber if water leaks from under the sink when the disposal runs. This usually means the seal between the disposal and the sink flange has failed, and the unit needs to be resealed or replaced. Leaks will damage the cabinet and the floor if left alone.
If the disposal is more than 10 years old and stops working, replacement is often cheaper than repair. A new disposal costs $150 to $400 installed, depending on the model. An older unit that fails may not be worth fixing.
Frequently Asked Questions
Can I use a plunger on a garbage disposal?
Yes, but only if the disposal is off and the breaker is switched off. Fill the sink with water, place the plunger over the drain opening, and plunge firmly 10 to 15 times. This can dislodge clogs in the drain pipe below the disposal. Do not plunge while the disposal is plugged in or turned on.
What should I do if something metal falls into the disposal?
Turn off the power at the breaker when ready and leave it off. Use a flashlight and pliers to fish out the object. Do not turn the disposal on — metal objects can damage the impellers or fly out and cause injury. Once you have removed the object, check that nothing else is loose before restoring power.
Is it safe to put bones down the garbage disposal?
No. Bones are too hard and will jam the impellers or damage them. Stick to soft food scraps like cooked vegetables, fruit, and small amounts of meat. Bones belong in the trash or compost.
Why does my disposal smell bad even though it works?
Food particles and bacteria build up in the chamber over time. Run cold water and a cut lemon through the disposal weekly, or use ice cubes to scour the walls. If the smell persists, the drain pipe below may be clogged — use a plunger or call a plumber to clear it.
Can I fix a leaking garbage disposal myself?
Minor leaks from the top seal can sometimes be tightened by hand, but most leaks mean the seal has failed and the unit needs to be resealed or replaced. This is a plumbing job — attempting it yourself risks water damage. Call a plumber to assess and repair it.