--- title: "How to Reset a Garbage Disposal with an Allen Wrench" canonical: "https://thetoolwave.com/how-to-reset-garbage-disposal-with-allen-wrench/" author: "Marcus Vance" published: "2026-11-11T07:00:00+00:00" modified: "2026-09-25T10:19:12+00:00" language: "en-US" site: "The Tool Wave" description: "If your garbage disposal hums but won't spin, you likely need to learn how to reset garbage disposal with allen wrench. It’s one of the simplest DIY fixes…" categories: "Hand Tools" attribution: "The Tool Wave (https://thetoolwave.com/)" --- # How to Reset a Garbage Disposal with an Allen Wrench If your garbage disposal hums but won't spin, you likely need to learn how to reset garbage disposal with allen wrench. It’s one of the simplest DIY fixes for a stuck kitchen sink disposal, and it takes about five minutes once you know what to look for. Manufacturer specifications indicate that the reset button is a thermal overload protector, typically rated to handle 3, 5 amps before tripping. That little red button and the hex socket hidden underneath are your best friends when things go quiet but buzzing. Let’s walk through exactly where they are and how to use them safely. ## Quick Answer Turn off power at the breaker or unplug the disposal. Locate the hex socket on the bottom center. Insert a ¼-inch Allen wrench. Rotate it back and forth several times until the disk moves freely. Press the red reset button. Restore power. Run cold water and test. ## Why You Need the Allen Wrench (and Exactly Where to Look) The Allen wrench is the only tool that lets you manually turn the grinding disk from underneath. That hex socket is built into the motor shaft, giving you direct mechanical leverage. Most residential disposals from InSinkErator, Waste King, and Moen use a ¼-inch hex key. A few smaller units take a 5/32-inch, so check your manual if the bigger one doesn’t fit. You’ll find the socket on the very bottom of the disposal, dead center. On some models, a small plastic cap covers it. Pop that off with a flathead screwdriver or your fingernail, it’s just a dust cover. If you’re hunting for it and still can’t see it, run your hand along the bottom rim; a recessed socket feels like a tiny hole. Storing the Allen wrench nearby is smart. Many disposals ship with one clipped to the unit or taped to the power cord. If yours is long gone, any hardware store sells a cheap set. You’ll also want it for routine upkeep, a quick back-and-forth turn every few months keeps the disk from seizing. ## The Step-by-Step Visual Guide (With What to Actually Look For) Let’s break this into clear steps. Imagine you’re looking at the disposal from underneath, you’ll see a cylindrical metal housing with a hexagon-shaped hole dead center. ### Step 1: Kill the Power Flip the circuit breaker or pull the plug under the sink. Never rely on the wall switch alone, someone could flip it on while you’re inside. ### Step 2: Find the Hex Socket Look for that small recessed hole. If you see a plastic tab, pry it off. A ¼-inch Allen wrench should slide in easily with no resistance. ### Step 3: Insert and Rotate Push the long end of the wrench into the socket. Turn it clockwise until you meet resistance, then back counterclockwise. Keep alternating in short, firm arcs, about 30 degrees each way. You’re not trying to spin it a full circle; you’re breaking the jam. After a few back-and-forth motions, you should feel the disk suddenly free up and turn smoothly. ### Step 4: Press the Reset Button With the wrench still in place (or removed, your call), locate the red reset button on the bottom or side of the unit. Push it until you hear a click. That means the overload protector has re-engaged. ### Step 5: Test Remove the wrench. Restore power. Turn on cold water and flip the switch. The disposal should hum and spin normally. If it still hums without spinning, repeat the rotation step. | Tool / Item | What to Look For | | --- | --- | | Allen wrench | ¼-inch or 5/32-inch hex key | | Hex socket | Center bottom, may have plastic cover | | Reset button | Red, on bottom or lower side | | Power disconnection | Breaker off or plug pulled | ## What That Humming Sound Means (And How the Wrench Fixes It) That buzzing noise is the motor trying to run but failing. Inside, a spinning disk with metal impellers is supposed to grind food scraps. When something hard, like a fruit pit, chicken bone, or a dropped spoon, jams the disk, the motor can’t turn it. The motor’s thermal overload protector trips after a few seconds to prevent burn-out. That’s why you hear the hum for a moment, then silence. The Allen wrench bypasses the motor entirely. You become the motor. By turning the hex socket manually, you rotate the disk in the opposite direction of the jam or push the obstruction out of the way. Once the disk moves freely, the overload can be reset. If the disk is stuck by something like a metal utensil, the manual rotation might only move it a little. In that case, you may need to reach inside the disposal (with power off and the sink drain clear) and pull out the object. Never use a flashlight and your bare fingers, use long pliers. The wrench alone can’t remove foreign objects, only free the disk. ## Three Common Visual Mistakes That Keep Your Disposal Stuck Most frustrations come from overlooking simple details. Here are the top three errors people make when trying to reset a garbage disposal with an Allen wrench. ### Mistake 1: Missing the Hex Hole Behind the Plastic Cover Many users see a smooth metal bottom and assume there’s no hex socket. But on budget models or older units, the socket is hidden under a small circular plastic cap. It’s usually flush with the housing. Pry it off gently, it’s not glued, just snapped in place. If you skip this step, you’ll never find the hole. ### Mistake 2: Using the Wrong Wrench Size A ¼-inch wrench fits most disposals, but some take 5/32-inch or even 3/16-inch. Forcing the wrong size strips the hex socket, making future repairs harder. Check your owner’s manual or test a few sizes until one slides in without wobbling. ### Mistake 3: Only Rotating One Direction Some people twist the wrench clockwise until it stops and then give up. That’s like trying to open a jar by only turning one way. The jam might be tight in that direction, but looser the other way. Always rock the wrench back and forth in small arcs. You’re trying to break a wedge, not turn a screw. If the disposal still hums after following the correct steps, you may be dealing with a more serious issue. ## When the Wrench Won’t Do It (And You Need a Different Tool) The Allen wrench method works for about 80% of jams, but sometimes the problem isn’t a simple blockage. Here’s when you need a different approach. ### Seized Motor Bearings If the motor itself has bad bearings, the shaft will feel gritty or won’t turn at all, even with the wrench. You’ll feel grinding resistance or no movement. This usually means the disposal needs replacement. No amount of manual rotation will fix worn bearings. ### Broken Grinding Ring or Impeller Occasionally, a foreign object cracks the grinding ring or breaks an impeller. The disk might turn freely with the wrench, but the disposal still makes a rattling noise and fails to grind. You’ll need to open the unit or replace it. ### Electrical Failure If the disposal doesn’t hum at all after resetting, the motor may have burned out, or the wiring is faulty. Check the breaker first. If that’s fine, use a multimeter to test for continuity. No continuity means the motor is dead. ### Alternative Tools for Stubborn Jams For jams that the Allen wrench can’t reach, try a broom handle from above. Insert the handle into the disposal opening (power off) and manually turn the disk. Some disposals have a dedicated jam-bar socket on the side, check your manual. A pro plumber’s disposal wrench is another option; it attaches to the bottom hex and gives more leverage. If nothing works, a service call will cost around $100, 150, but a new disposal runs $80, 200. Weigh the cost against the age of your unit. A disposal older than 10 years is usually worth replacing rather than repairing. For tips on maintaining other tools around the house, see our guide on using a fan clutch removal tool, it’s a similar principle of applying manual force to free a stuck part. And if your disposal’s hex socket has rusted, our advice on what takes rust off tools can help clean it up. ## Safety First: The Two-Step Power Check (Before You Touch Anything) Working on a garbage disposal is safe if you follow one rule: disconnect all power before you insert anything into the hex socket. That includes the Allen wrench, your fingers, or a flashlight. The easiest way is to unplug the disposal under the sink. Most units have a standard three-prong plug on the wall or a dedicated outlet inside the cabinet. If your disposal is hardwired, flip the breaker and tape it off so nobody accidentally flips it back. Never trust the wall switch alone. Someone else in the house could flip it on while you’re working. Even if you’re sure it’s off, double-check. Use a non-contact voltage tester near the wiring. No tester? Plug a small lamp into the same outlet and confirm it turns off when you hit the breaker. After you confirm the power is off, wait 60 seconds. The internal motor can hold a charge briefly. Let it discharge completely before you touch the metal housing or the hex socket. Wear insulated gloves if you need to reach inside the disposal chamber. A dropped screwdriver or a stray bit of glass can still cut you. Even with the power off, the grinding disk has sharp edges. For more details on tool safety in general, see our comprehensive guide on how to use a grinder tool. Per UL safety standard 430 for electric food waste disposers, the overload protector is designed to trip under locked-rotor conditions. That reset button is your safety checkpoint. Press it only after you’ve manually freed the disk, not before. Pressing it while the jam is still active just trips the protector again and wears out the mechanism faster. If the reset button feels loose or doesn’t click, the thermal overload may be damaged. In that case, call a licensed electrician or replace the unit. Disposers are inexpensive compared to the risk of an electrical fire. ## Frequently Asked Questions ### What size Allen wrench do I need for my garbage disposal? Most residential disposals use a ¼-inch Allen wrench. Some models from Waste King and older units use 5/32-inch or 3/16-inch. Check your owner’s manual or try a few sizes until one fits snugly without wobbling. A standard hex key set covers all common sizes. ### Why does my disposal hum but not spin? That humming means the motor is receiving power but the grinding disk is jammed. The Allen wrench lets you manually rotate the disk to break the obstruction. If the hum lasts more than a few seconds, the thermal overload trips and the unit goes silent. Reset it after you free the disk. ### Can I use a screwdriver instead of an Allen wrench? Not recommended. A screwdriver can slip and damage the hex socket or strip the metal. The Allen wrench fits precisely and gives better leverage. If you don’t have one, try a broom handle from above to rotate the disk, or buy a cheap hex key set under $10. ### The reset button won’t stay pushed. What now? If the button pops back out immediately, the overload protector is still sensing a locked motor. That means the disk isn’t fully free. Repeat the manual rotation with the Allen wrench. If it still won’t stay after several attempts, the thermal protector may be faulty and the disposal needs replacement. ### How often should I need to reset my garbage disposal? A properly used disposal should rarely need a reset. Occasional trips happen after heavy loads like potato peels or fibrous vegetables. Routine monthly maintenance, a quick back-and-forth turn with the Allen wrench, helps prevent jams. Run cold water before and during grinding to keep things moving. ### Is it safe to use the disposal right after resetting it? Yes, as long as you followed the power disconnection steps. After resetting, run cold water and test with a small amount of food waste first. Listen for unusual noises that might indicate a remaining obstruction. If you’re dealing with rusted parts, see our advice on what removes rust from tools to clean up the hex socket before the next jam.