How to Fix a Garbage Disposal That's Jammed or Humming But Not Working
Learn how to safely unjam a stuck garbage disposal with a hex wrench or broom handle, reset the motor, and clear common clogs without calling a plumber.
There are few kitchen sounds more frustrating than reaching for the switch and hearing nothing but a low hum — or worse, silence. A jammed garbage disposal is one of the most common home repair headaches, and the good news is that most jams are fixable in under 15 minutes with no tools beyond a hex wrench and a flashlight.
This guide walks you through every step safely, from identifying the problem to preventing future jams.
What’s Happening Inside the Disposal
Before you diagnose, understand the anatomy. A garbage disposal has a spinning impeller plate (the “turntable”) driven by an electric motor. When you turn it on, the motor spins the plate, which throws food waste against a stationary grinding ring.
A jam happens when something solid — a chicken bone, fruit pit, or piece of silverware — lodges between the impeller plate and the grinding ring, locking the motor. The motor tries to spin but can’t. You hear a hum or nothing at all.
A seized motor (no sound, no hum) might mean the internal thermal overload switch tripped, or the motor burned out entirely.
Safety First — Read This Before Touching Anything
- Unplug the disposal under the sink, or flip the breaker that controls it. Do not rely on the wall switch alone.
- Verify power is off by trying the switch — nothing should happen.
- Use a flashlight, not your fingers, to inspect the chamber.
- Keep pliers, tongs, or a hex wrench nearby — never your hands.
Step 1: Check for an Obvious Jam
Shine a flashlight into the disposal opening. Look for:
- Large food debris blocking the opening
- A utensil or bottle cap that fell in
- A visible bone or pit wedged sideways
If you see a foreign object, use long-handled tongs or needle-nose pliers to remove it. Never use your fingers.
Step 2: Manually Rotate the Impeller Plate (The Hex Wrench Method)
Every garbage disposal comes with a hex (Allen) wrench — usually a 1/4-inch size — stored in a clip on the side of the unit or at the bottom. If you’ve lost it, you can buy one at any hardware store for under $5.
- Find the hex socket at the very center of the bottom of the disposal, under the sink.
- Insert the hex wrench and turn it back and forth using moderate force.
- You’ll feel resistance — you’re rotating the stuck impeller plate manually.
- Turn it clockwise a full rotation, then counterclockwise. Repeat until the plate spins freely through a full rotation.
- Remove the hex wrench.
Step 3: Press the Reset Button
After freeing the jam, look for the red reset button on the bottom or side of the disposal unit (usually at the bottom center near the motor housing).
- Press it firmly — you should hear or feel a click.
- If the button won’t press or immediately pops back out, the motor may still be jammed or the thermal overload hasn’t reset yet. Wait 5–10 minutes and try again.
Step 4: Test It
With the disposal unplugged and the manual rotation complete, plug it back in and run cold water. Flip the switch. The disposal should spin up normally.
- If it spins but sounds rough or grinds, there may be a small fragment still inside. Run cold water for 30 seconds to flush it out.
- If it still hums without spinning, you may have a stuck impeller or a seized bearing. Try the hex wrench method again with more back-and-forth motion.
Step 5: Clear Any Remaining Clog
If the disposal runs but water drains slowly or backs up, the clog is in the drain line, not the disposal itself.
- Plunge the drain. Fill the sink partway with water, hold a plunger over the disposal-side drain (cover the other sink drain if you have a double sink), and plunge vigorously.
- Check the drain trap. The U-shaped pipe under the sink. Place a bucket under it, unscrew the slip nuts, and clear any debris.
When to Call a Pro
These situations mean it’s time for a plumber or replacement:
- The disposal leaks water (cracked housing or bad gasket)
- The motor won’t spin at all after manual rotation and reset
- You smell burning electrical (motor may be burned out)
- The reset button keeps tripping every time you try to run it
- The unit is more than 10–12 years old and frequently jams — replacement is usually cheaper than repeated repairs
How to Prevent Future Jams
| Do This | Avoid This |
|---|---|
| Run cold water while and after using the disposal | Pouring grease or oil down the drain |
| Cut fibrous foods (celery, corn husks) into small pieces | Putting large bones, pits, or shells in the disposal |
| Grind citrus peels to freshen and clean the unit | Overloading the disposal with too much food at once |
| Run ice cubes and salt monthly to sharpen the blades | Using chemical drain cleaners in the disposal |
| Clean with baking soda and vinegar weekly | Putting expandable foods (rice, pasta, potato peels) in large quantities |
Quick Recap
- Unplug or kill the breaker. Safety first.
- Check for visible jams — remove foreign objects with tongs.
- Use the hex wrench at the bottom of the unit to manually free the impeller plate.
- Press the reset button on the bottom of the disposal.
- Test with cold water running.
- Call a plumber if it leaks, smokes, or won’t reset.
A jammed garbage disposal is a nuisance, not a crisis. With a $5 hex wrench and five minutes of work, you can almost always get it spinning again and save yourself a service call.