A garbage disposal not working is one of the most common kitchen calls a plumber gets, and most of them end with a $5 hex key and ten minutes under the sink. When it stops, the sound it makes (or doesn’t make) tells you where to look. This guide sorts the fixes by symptom, so you can go straight to yours.
If the disposal is silent, press the red reset button on the bottom and check the wall switch, breaker and any GFCI outlet. If it hums but won’t spin, it’s jammed: cut the power, turn the socket on the bottom with a 1/4-inch hex key until it moves freely, pull debris out with tongs, then reset. Never put your hand inside or use chemical drain cleaners.
Safety rules before you touch it↑ Contents
A disposal motor can start the instant power returns, and a jammed one can free itself and spin without warning.
Cut power twice. Turn the wall switch off, then either unplug the disposal from the outlet under the sink or switch off its breaker. A switch can be bumped by someone else in the kitchen. A pulled plug cannot.
Never put your hand in the grinding chamber. Not to feel for a jam, not to grab a spoon. Use a flashlight to look and tongs or pliers to grab. InSinkErator’s own jam-clearing guide says not to put your hand in the disposal at any time.
No chemical drain cleaners. Lye and acid cleaners corrode the metal parts and the seals. Moen warns that chemical drain cleaners cause serious corrosion and void the warranty.
If the disposal is hard-wired instead of plugged in, use the breaker. Scorch marks, a burning plastic smell or water dripping onto the wiring mean stop and call a pro.
Find your symptom↑ Contents
Flip the switch on for two or three seconds with cold water running, listen, then flip it off.
- Dead silence, no hum, no clickNo power is reaching the motor, or the thermal overload has tripped. Go to the reset button, switch and breaker section.
- A steady hum, but nothing spinsThe motor is getting power but the plate is stuck. Classic jam.
- It runs, but the sink drains slowly or backs upThe disposal works; the drain line below it is clogged.
- Water under the sinkA seal or connection is leaking.
- It runs fine but smellsFood film on the splash guard and inside the chamber.
- Grinding metal noise or loud rattlingSomething hard is inside, like a bottle cap, a fruit pit or silverware. Power off and fish it out with tongs before running it again.
No sound at all: power and the reset button↑ Contents
A completely silent disposal is almost always a power problem, not a dead motor. Work from the unit outward.
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Press the garbage disposal reset button
A thermal overload protector cuts the motor when it overheats, usually after a jam. On InSinkErator units it’s a small red button on the bottom of the housing. When it has tripped, it sits about 1/4 inch lower than normal, according to InSinkErator. Turn the wall switch off, then press the button gently until it clicks and stays in.
If it won’t stay in, the motor is still hot. InSinkErator’s reset instructions say to wait ten minutes and try again. Then run cold water and switch the disposal on.
The button trips for a reason. If it pops again within a few seconds, the disposal is probably jammed. Skip ahead to the humming section and free the plate first.
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Check the wall switch
If the switch feels loose or gives no firm click, it may be the culprit. On units with a countertop air button, check that the small air tube under the sink is still on its fitting. Replacing a wall switch is a job for an electrician if you’re not comfortable with wiring.
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Look for a tripped breaker or blown fuse
Go to the panel and find the breaker for the disposal. A tripped breaker sits in the middle position. Push it fully off, then back on. If it trips again as soon as you run the disposal, stop there: a motor that pulls enough current to trip a breaker is either jammed hard or failing.
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Reset the GFCI outlet
Many kitchens have the disposal plugged into a GFCI outlet, or into a regular outlet protected by a GFCI somewhere else on the circuit, often by the counter. Press the reset button on each GFCI in the kitchen. Also make sure the plug hasn’t worked loose.
Reset button in, breaker on, outlet live (test it with a lamp), and still silent? The motor has failed, which on an older unit means replacement.
Humming but not spinning: how to unjam a garbage disposal↑ Contents
A garbage disposal humming without turning means the motor is trying to start but the grinding plate can’t move. Something hard is wedged between the plate and the grind ring. Switch it off within a few seconds: a stalled motor heats up fast and trips the overload.
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Kill the power completely
Wall switch off, then unplug the unit or turn off the breaker. Bail out any standing water so you can see into the chamber.
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Find the hex socket on the bottom
Look at the center of the underside of the disposal, facing the floor. You’ll see a small six-sided hole. Lost the wrench that came with it? A standard 1/4-inch Allen wrench fits InSinkErator models, as the manufacturer confirms.
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Work the wrench back and forth
Insert the wrench and rock it in both directions like a crank. Expect resistance at first. Some force is fine: InSinkErator says its wrench is built to bend before the disposal breaks. Keep going until the wrench turns full circles freely in both directions. That means the plate is free.
No socket on the bottom? Some units (InSinkErator lists its Builder Series among them) are freed from above: with the power off, turn the plate with a wooden spoon handle, as Waste King’s FAQ also suggests.
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Remove the object with tongs
Shine a flashlight into the drain opening and look around the outer edge of the plate, where the small teeth are. Pull out whatever you find with kitchen tongs or long-nose pliers. Never your fingers.
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Reset, restore power and test
Press the red reset button. Plug the unit back in or turn the breaker on. Run a moderate stream of cold water, then turn the disposal on. If it jams again, repeat the wrench step.
Still humming after the plate turns freely by hand? The motor’s start winding or capacitor may be failing, or the bearings are seized. A new disposal usually costs less than that repair.
Slow drain or clogged sink↑ Contents
When the disposal spins fine but water sits in the sink, the clog is in the trap or the drain line below the disposal. The usual cause is grinding too much at once with too little water.
- Run it longer with more water. Run cold water at a moderate flow, run the disposal, and keep the water going for a few seconds after the grinding sound stops. That flushes the line.
- Plunge the sink. With power off, use a cup plunger over the disposal side. On a double sink, plug the other drain with a stopper or a wet rag so you’re not just pushing water back and forth.
- Clean the P-trap. Put a bucket under it, loosen the two slip nuts by hand, and empty it. Most stubborn clogs live here.
- Check the dishwasher knockout on a new install. If the dishwasher won’t drain after a new disposal goes in, the plastic knockout plug in the dishwasher inlet may never have been removed.
Still clogged after plunging and clearing the trap? The blockage is farther down, and that’s a job for a drain snake or a plumber, not chemicals.
Garbage disposal leaking↑ Contents
A garbage disposal leaking can come from four places, and the fix depends entirely on which one. Dry everything with a towel, put a piece of paper or a dry towel under the unit, fill the sink partway, then let it drain and watch. InSinkErator’s leak guide recommends this kind of test, and warns to make sure water isn’t running down from higher up before blaming the lowest point.
Top: the sink flange
Water at the top of the disposal, where it meets the sink, means the seal under the sink flange has failed or the mounting ring has loosened. Tighten the mounting assembly first. If it still drips, the flange needs to come out and be reset with fresh plumber’s putty.
Side: the dishwasher hose
The small inlet on the side takes the dishwasher drain hose. Leaks here usually come from a loose hose clamp or a cracked hose. Tighten the clamp, and replace the hose if it’s split.
Side: the drain connection
The larger outlet connects the disposal to the drain pipe. A worn gasket or loose flange bolts cause drips here. Tighten the bolts and replace the gasket if it’s flattened or brittle.
Bottom: the housing itself
If water comes from the bottom of the disposal, from the reset button area or from the body, the internal seals have failed or the housing has cracked. That isn’t repairable at home. InSinkErator’s guide sends bottom and body leaks to its support line rather than offering a fix. In practice, a disposal leaking from the body is a disposal that needs replacing. Unplug it right away.
Bad smells↑ Contents
The smell almost always comes from the rubber splash guard, not deep inside the unit. Waste King says most odors come from food buildup on the underside of the splash guard, and recommends scrubbing it with baking soda, warm water and a scouring pad.
- With the power off, lift the edge of the splash guard and scrub its underside. Some models let you pull it out entirely; Waste King’s EZ Mount guards can go in the dishwasher.
- Grind a handful of ice cubes with cold water. It knocks film off the chamber walls.
- Run more water after each use. Food that sits in the chamber overnight is what rots.
A sewer smell rather than a food smell points to the trap. Clean it as described in the drain section.
What not to put in a disposal↑ Contents
Most jams and clogs start with something that shouldn’t have gone down. InSinkErator is firmest about fats, oils and grease, which collect in the pipes downstream. Waste King adds large bones, shells and caustic cleaners. Keep these out:
- Grease, oil and fat. Liquid when hot, solid in the pipe.
- Large bones and shellfish shells. Too hard to grind.
- Non-food items. Glass, metal, plastic, twist ties, rubber bands, cigarette butts.
- Too much at once. Feed scraps gradually with water running.
- Coffee grounds and eggshells in quantity. InSinkErator says they don’t harm the disposal, but they can slow older drains. Small amounts only.
- Chemical drain cleaners and hot grease. Waste King lists both, and both damage the unit or the pipes.
Use cold water while grinding. InSinkErator advises a moderate flow of cold water during grinding and saving hot water for between uses. Hot water keeps any fat liquid until it cools and sticks farther down the line.
Repair or replace?↑ Contents
On an older unit, replacement often costs less than a service call. Replace it when:
- Water leaks from the bottom or the body of the housing.
- The housing is visibly cracked or badly rusted.
- The plate turns freely by hand but the motor still only hums or stays silent.
- The reset button trips over and over with no jam in sight. InSinkErator says repeated resets mean the unit may need service or replacement.
- The unit is a decade or more old and jams often, grinds slowly or sounds rough.
Before you buy, check the warranty. Many disposals carry multi-year in-home warranties, and the model and serial number are on a label on the side or bottom of the unit. Swapping in a disposal of the same brand and mount type is a manageable DIY job; new wiring is for an electrician.
Garbage disposal not working: FAQ↑ Contents
Where is the garbage disposal reset button?
On the bottom of the unit, under the sink. It’s usually a small red button near the center or toward the edge of the base. A tripped button sits slightly lower than normal. Turn the switch off, press it until it stays in, then try again with cold water running.
Why is my garbage disposal humming but not working?
The motor has power but the grinding plate is stuck, usually by a pit, bone or bit of metal. Turn the power off at the switch and unplug it or flip the breaker, then turn the hex socket on the bottom with a 1/4-inch Allen wrench until it spins freely. Remove the debris with tongs and press reset.
Can I use Drano in a garbage disposal?
No. Manufacturers say chemical drain cleaners corrode the metal parts and seals, and using them can void the warranty. Use a plunger or clean the P-trap instead.
Why did my garbage disposal stop working suddenly?
Most often the thermal overload tripped after a jam or a long run. Press the reset button. If that doesn’t help, check the wall switch, the breaker and any GFCI outlet in the kitchen. A disposal that stays silent with confirmed power has a failed motor.
Is a leaking garbage disposal worth fixing?
Depends on where it leaks. Leaks at the sink flange, dishwasher hose or drain connection are cheap fixes: tighten, reseal or replace a gasket. A leak from the bottom or body means the internal seals or housing have failed, and the unit should be replaced.
A garbage disposal not working usually comes down to one of three things: a tripped reset button, a jam you can clear with a 1/4-inch hex key, or a power problem at the switch, breaker or GFCI. Kill the power before every check, keep your hands out of the chamber, and leave chemical cleaners on the store shelf. If the body leaks or the motor won’t run with the plate spinning freely, replace the unit.
Sources: InSinkErator: fixing a jammed garbage disposal, InSinkErator: garbage disposal leaking, Waste King support FAQ, Moen: drain cleaners and garbage disposals.