How to Fix a Jammed Garbage Disposal That's Humming but Not Spinning

Learn how to fix a garbage disposal that's humming but not spinning — use the hex wrench reset, manual spin, and reset button to clear jams in minutes.

That hum — the sound of your garbage disposal motor running but the blades not turning — is frustrating, but it’s usually an easy fix. A humming disposal means the motor is getting power, but the grinding plate is stuck. Here’s how to free it, step by step.

Why a Garbage Disposal Hums but Won’t Spin

The most common cause is a physical jam. Something hard — a chicken bone, fruit pit, piece of glass, or utensil — has lodged between the rotating grinding plate and the stationary shredder ring. The motor tries to spin but can’t. If left in this state too long, the motor can burn out or the thermal overload switch trips.

Other causes include:

• A seized motor bearing (less common, usually on older units)
• A bent or broken grinding plate
• A foreign object wedged crosswise under the plate

The fix starts with the simplest solution and works up.

Step 1: Press the Reset Button

Before you do anything mechanical, check the bottom of the disposal for a small red or black reset button. If the motor overheated and tripped the internal breaker, this button will be popped out.

1. Press it firmly until it clicks and stays depressed.
2. Flip the wall switch on. If it runs normally, you’re done.
3. If it still hums, flip the switch off and move to Step 2.

Step 2: Use the Hex Wrench (The Easiest Fix)

Every garbage disposal comes with a hex wrench (also called an Allen wrench) sized to fit the hex socket on the bottom center of the unit. Lose it? They’re under $5 at any hardware store, or use a 1/4-inch hex wrench for most InSinkErator models.

1. UNPLUG THE DISPOSAL or kill the breaker.
2. Look at the bottom of the disposal — there’s a center hex socket.
3. Insert the hex wrench and turn it back and forth manually.
4. You’ll feel resistance, then something will give. That’s the jam breaking free.
5. Turn the wrench through a full 360-degree rotation to make sure the plate spins freely.
6. Remove the wrench, plug the unit back in, and test it.

This works for about 80% of humming disposals. The wrench directly rotates the grinding plate from below, dislodging whatever is stuck.

Step 3: Manual Spin from Above

If the hex wrench trick doesn’t work, the jam might be at the top of the shredder ring.

1. Keep the disposal unplugged.
2. Get a flashlight and look down into the disposal opening.
3. Use tongue-and-groove pliers or a wooden spoon handle — never your fingers — to reach in and try to rotate the grinding plate.
4. If you see a visible obstruction (a utensil, bone, bottle cap), grab it with long-handled kitchen tongs and pull it out.
5. Once the plate rotates freely, plug it in and test.

Step 4: Check for a Tripped Circuit Breaker

If the disposal won’t run at all (no hum, no sound), check your home’s electrical panel. A tripped breaker or blown GFCI outlet can cut power to the disposal.

• Look for a tripped breaker in the panel and reset it.
• Check for a GFCI outlet under the sink or nearby — press the RESET button.
• If the disposal has a wall switch, make sure it’s not defective by testing it with a multimeter.

Step 5: Clear Stubborn Jams with a Disposal Wrench

Still stuck? Some disposals (like Waste King models) don’t have a bottom hex socket. In that case:

1. Use a disposal jam-buster wrench — a specialized tool that hooks into the grinding plate from above.
2. Insert the tool and turn the plate manually until it spins freely.
3. Flush with cold water to wash out debris.

When to Call a Pro

Most garbage disposal jams are fixable in under 15 minutes. But call a plumber if:

• The disposal is leaking water from the bottom (seal failure)
• The motor smells like burning or the unit is hot to the touch even after cooling
• You’ve tried every step above and it still won’t spin
• The disposal is more than 10 years old and has recurring jams

A new basic disposal costs $80–$150, and installation takes a plumber about an hour. Sometimes replacement is cheaper and safer than fighting a dying unit.

Prevention: What Not to Put Down the Disposal

Keep your disposal running smoothly by avoiding these common jam-causers:

• Fibrous foods: Celery, corn husks, artichokes, onion skins (fibers wrap the shaft)
• Hard materials: Bones, fruit pits, popcorn kernels, seafood shells
• Expandable starches: Pasta, rice, potato peels (they expand with water and clog)
• Grease and oil: Never pour grease down the drain — it solidifies and binds the moving parts
• Utensils: Always check the sink before running the disposal

The 30-Second Daily Maintenance Trick

Once a week, toss a handful of ice cubes and lemon or orange peels into the disposal while running cold water. The ice sharpens the blades and knocks off residue; the citrus cleans and deodorizes. Drop in a few baking soda tablets once a month for deeper cleaning.

With these steps, you can fix most garbage disposal jams yourself in under 10 minutes and avoid the $100+ service call. When in doubt, always default to safety — unplug it first, and never use chemical drain cleaners in a disposal (they damage the seals and can splash back).