Garbage Disposal Humming But Not Spinning? Here's the Fix

Reviewed by homemd.ai editorial team · Last updated: March 15, 2026

1. What's Happening

The humming means the motor is getting power but the flywheel is stuck. Something (bone, utensil, glass) is jammed between the impellers and the grinding wall. The motor tries to spin, can't, and just buzzes.

If there is no sound at all when you flip the switch, that's a different problem — check the reset button first, then the circuit breaker.

2. How to Fix It (15 Minutes, No Experience Needed)

1. Cut power completely — unplug the disposal under the sink OR turn off the breaker. Do not rely on the wall switch alone.
2. Look inside with a flashlight — you'll usually see a bone, utensil, or glass shard stuck between the impellers.
3. Remove debris with tongs or pliers — never put your hand inside, even with power off.
4. Manually free the motor from below — insert a 1/4-inch Allen wrench into the hex hole on the bottom center of the disposal. Turn it back and forth until it moves freely.
5. Press the reset button — small red or black button on the bottom of the unit. If it tripped, you'll feel a click.
6. Restore power and test — run cold water first, then flip the switch. You should hear a smooth spin.

3. What If It Still Hums After Unjamming?

• Hex wrench won't budge at all — the motor may be seized. Replacement likely needed.
• Spins freely by hand but still only hums — the capacitor or motor is failing. Replace the unit.
• No sound at all (not even humming) — check reset button, then breaker, then wall switch wiring.

4. Parts You Might Need

1/4-inch Allen Wrench — $0 (usually included with disposal) — View at Home Depot

InSinkErator Badger 5 (1/2 HP) — ~$100 (if replacement needed) — View at Home Depot

Waste King L-1001 (1/2 HP) — ~$90 (budget option) — View at Home Depot

5. Cost Breakdown: DIY vs Plumber

You save $150–$350 on the unjam (it's literally free).

6. How to Prevent Future Jams

• Always run cold water before, during, and after using the disposal.
• Never put bones, fruit pits, coffee grounds, or grease down the disposal.
• Feed waste in small amounts, not all at once.
• Run the disposal regularly even if you don't need it — prevents rust and buildup.

FAQ

Why is my garbage disposal humming but not spinning?
Something is jammed between the impellers. Use a 1/4-inch Allen wrench from below to free it, then press the reset button.

Can a garbage disposal burn out from humming?
Yes. If the motor is stuck and keeps humming, it can overheat and trip the thermal overload. Turn it off immediately and fix the jam.

How much does a plumber charge to fix a garbage disposal?
$150 to $350 depending on whether it's a simple unjam or a full replacement. The unjam is free if you do it yourself.

Frequently Asked Questions