Key takeaways
- Reaching inside with your hand. Even with the power off, sharp objects and grinder components can cause cuts.
- Using hot water to test the disposal. Cold water helps keep fats more solid so they can move through the plumbing instead of coating pipes.
- Forcing the hex wrench. The wrench is for rocking the grinding plate free, not for overpowering a seized motor.
- Running the disposal dry after a jam. Always use a steady water flow during the test run.
- Pouring chemical drain cleaner into the disposal. Caustic cleaners can splash back during repair, damage components, and make a later plumbing service more hazardous.
- Ignoring a repeated hum or reset problem. A recurring jam may point to worn internal parts, a failing motor, or an object trapped beyond reach.
A jammed garbage disposal can turn a simple cleanup into a noisy, messy problem. When the motor hums but the grinding plate will not turn, something hard—such as a fruit pit, small bone, utensil, or piece of glass—may be wedged inside. Trying to force it by repeatedly flipping the switch can overheat the motor, trip the overload protector, damage internal components, or create a splash hazard.
The safest first fix is usually turning the disposal manually with its built-in hex-wrench socket. This method frees many common jams without removing the unit or reaching into the drain. Work slowly, keep the power off, and use tongs rather than your hands to remove anything you find.
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What You Need
| Item | Why | Optional? |
|---|---|---|
| 1/4-inch hex wrench | Fits the bottom-mounted turning socket on many InSinkErator-style disposals. | No, for units with a hex socket |
| Manufacturer-specific unjamming wrench | Some disposals use a proprietary tool or a top-side mechanism instead of a standard bottom hex socket. | Depends on model |
| Flashlight | Helps you inspect the sink opening for the obstruction. | Recommended |
| Long-handled tongs or needle-nose pliers | Lets you remove loose debris without putting a hand into the disposal. | Recommended |
| Dish towel | Catches drips and makes kneeling under the sink more comfortable. | Yes |
| Bucket | Useful if you notice a leak while inspecting the disposal or drain connections. | Yes |
A basic 1/4-inch Allen wrench often comes with the disposal and may be stored under the sink. If it is missing, replacement unjamming tools are inexpensive: compatible wrench tools commonly cost about $4 to $10. Before buying one, check the disposal’s brand and model number. A standard bottom-mounted hex wrench is common on many InSinkErator units, while some Moen models use a tool designed to dislodge jams from above the sink.
Step-by-Step
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Turn off all power to the disposal (2 minutes)
Switch the disposal off at the wall switch first. Then unplug it from the outlet under the sink. If your disposal is hardwired, turn off the correct circuit breaker at the electrical panel. Do not rely on the wall switch alone, especially if someone else could accidentally turn it on while you are working.
Test that the disposal has no power by briefly flipping the wall switch after it is unplugged or the breaker is off. It should remain silent. Keep the switch in the off position for the rest of the repair.
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Clear standing water and inspect from above (3 to 5 minutes)
If the sink is full of water, bail out enough water with a cup or small container so you can see down the drain. Shine a flashlight into the disposal opening. Look for obvious items such as bottle caps, twist ties, corn cob pieces, pits, shells, metal tabs, or silverware.
Never put your hand into a garbage disposal, even when it is unplugged. Use long-handled tongs or needle-nose pliers to lift out anything you can clearly see and securely grip. If an object is tightly lodged, leave it in place for now; the hex wrench may loosen it.
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Locate the hex socket underneath the unit (1 minute)
Place a towel beneath the disposal and look at the center of its bottom plate. On compatible models, you will find a recessed hex-shaped socket. This is the manual turning point for the grinding mechanism. It is usually near the red overload-reset button, but do not confuse the two.
If there is no hex socket, stop before improvising with other tools. Check the owner’s manual or the manufacturer’s instructions for your model. A top-side unjamming wrench may be required instead.
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Insert the hex wrench and work the plate back and forth (2 to 4 minutes)
Push the short end of a 1/4-inch hex wrench fully into the socket. Turn it clockwise until it stops, then turn it counterclockwise until it stops. Repeat this back-and-forth motion several times. You are not trying to spin the mechanism rapidly; you are applying controlled leverage to free whatever is wedged between the rotating plate and the grind ring.
Use firm, steady pressure, but do not stand on the wrench, strike it with a hammer, or use a cheater bar for extra leverage. If the wrench will not move at all, or if you hear sharp cracking sounds, stop. Excessive force can damage the disposal or the mounting assembly.
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Remove the loosened obstruction (2 to 5 minutes)
After working the wrench, look down through the sink opening again with the flashlight. The jammed item may now be visible or loose enough to retrieve. Use tongs or pliers to remove it. Common culprits include chicken bones, avocado pits, small rocks from produce, spoon handles, and broken glass.
Once the item is removed, turn the hex wrench again. The mechanism should move more freely through a wider range of motion. A little resistance is normal; a solid, immovable stop is not.
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Reset the overload protector if needed (1 minute)
If the disposal had been humming, stopped during use, or feels warm, its overload protector may have tripped. With power still disconnected, press the small red reset button on the bottom of the disposal. If it will not stay in, wait 10 to 15 minutes for the motor to cool, then press it again.
Do not keep pressing a reset button that immediately pops back out. That can indicate an unresolved jam, an electrical problem, or a failing motor.
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Restore power and test with cold water (2 minutes)
Remove the hex wrench from beneath the unit. Plug the disposal back in or restore power at the breaker. Run a steady stream of cold water, then turn on the disposal. Let it run for 15 to 30 seconds. It should sound smooth and consistent rather than hum, grind harshly, or rattle.
Keep the cold water running for another 10 to 15 seconds after switching the disposal off. Check under the sink for leaks around the disposal body, dishwasher hose, drain pipe, and mounting ring.
Mistakes to Avoid
- Reaching inside with your hand. Even with the power off, sharp objects and grinder components can cause cuts.
- Using hot water to test the disposal. Cold water helps keep fats more solid so they can move through the plumbing instead of coating pipes.
- Forcing the hex wrench. The wrench is for rocking the grinding plate free, not for overpowering a seized motor.
- Running the disposal dry after a jam. Always use a steady water flow during the test run.
- Pouring chemical drain cleaner into the disposal. Caustic cleaners can splash back during repair, damage components, and make a later plumbing service more hazardous.
- Ignoring a repeated hum or reset problem. A recurring jam may point to worn internal parts, a failing motor, or an object trapped beyond reach.
How Often
You should not need to use a hex wrench as routine maintenance. Use it only when the disposal is jammed or the grinding plate will not turn. For everyday care, run cold water before, during, and for 10 to 15 seconds after grinding food scraps. Clean the removable splash guard periodically with warm soapy water, and grind small amounts at a time.
Avoid putting fibrous foods such as celery stalks, corn husks, onion skins, and artichoke leaves into the disposal. Also keep grease, coffee grounds, pasta, rice, large bones, fruit pits, and nonfood items out of it. These habits reduce clogs and jams far more effectively than frequent wrench use.
When to Call a Pro or Replace
Call a plumber or appliance repair professional if the disposal leaks from its housing, produces smoke or a burning smell, trips the breaker repeatedly, or remains jammed after you remove visible debris and use the correct wrench. Also get help if the sink drain is still backed up after the disposal runs normally; the clog may be farther down the drain line.
Replacement is often more practical when a disposal is leaking through the sealed body, has a cracked housing, or needs frequent resets. Residential disposals commonly range from about 1/3 to 1 horsepower. A 1/3- or 1/2-horsepower unit can suit light use, while 3/4- and 1-horsepower models generally handle heavier household food-prep loads with less risk of jamming. Confirm the mounting system, dishwasher connection, electrical setup, and cabinet clearance before choosing a new unit.
FAQ
What size hex wrench unjams a garbage disposal?
Many disposals with a bottom-mounted manual-turning socket use a 1/4-inch hex wrench. However, sizes and mechanisms vary by manufacturer and model, so verify your owner’s manual before buying a replacement wrench.
Why does my garbage disposal hum but not spin?
A humming sound usually means the motor has power but the grinding plate is blocked by a jam. Turn off power immediately, use the hex-wrench method if your model supports it, remove the obstruction with tongs, and reset the overload button if necessary.
Can I use a broom handle from the top instead of a hex wrench?
Only if your disposal manufacturer specifically provides or recommends a top-side unjamming tool. Do not force a random wooden handle into the disposal, as it can splinter, damage the splash guard, or push debris deeper into the grinding chamber.
What should I do if the hex wrench turns but the disposal still will not run?
Remove the wrench, check again for loose debris, press the red reset button, and test the unit with cold water. If it still hums, trips the breaker, leaks, or stays silent despite confirmed power, disconnect it and arrange professional service or replacement.
