Why Is My Garbage Disposal Humming But Not Working?

A humming garbage disposal means the motor is getting power but the flywheel is jammed — something is stuck between the impeller blades and the grind ring. This is a common, usually DIY-fixable problem. Step 1: Turn off the disposal and unplug it (or flip the breaker). Step 2: Look under the unit for a hex socket hole in the center bottom. Insert the 1/4-inch Allen wrench (hex key) that came with the disposal (or any 1/4-inch Allen wrench). Turn it back and forth to free the flywheel. Step 3: Look into the disposal with a flashlight and use tongs or pliers (never your hand) to remove the stuck object — common culprits are small bones, fruit pits, broken glass, and utensil parts. Step 4: Press the red reset button on the bottom of the unit. Step 5: Turn power back on and test. If the disposal doesn't hum at all (no sound), the motor has burned out or the reset button has tripped. Press reset first. If still nothing, the motor is dead — replacement is usually more cost-effective than repair at $150—$300 installed.

Garbage Disposal Humming But Not Working?

Updated June 2026 · Usually fixable in 5 minutes

TL;DR

Humming = jammed flywheel. The motor works but something is stuck. Turn off power, use the 1/4-inch hex key under the unit to manually rotate the flywheel, remove the stuck object with tongs, press the red reset button, and test. This fixes it 90% of the time. If the disposal doesn't hum at all (dead silent), press reset first. Still nothing? The motor burned out — replacement is $150—$300 installed.

ðŸ–ï¸ SAFETY FIRST

Never put your hand inside a garbage disposal. Even when off, the impeller blades are sharp. Use tongs, pliers, or a long wooden spoon handle to dislodge objects. Always turn off the disposal and unplug it (or flip the breaker) before working on it.

The 5-Minute DIY Fix

Turn off the disposal. Flip the wall switch to OFF. Better yet, unplug it under the sink or flip the breaker.
Find the hex socket. Look at the very bottom center of the disposal unit under the sink. There's a small hex hole. Insert a 1/4-inch Allen wrench (most disposals come with one — check the kitchen junk drawer).
Manually rotate the flywheel. Turn the Allen wrench back and forth. You'll feel resistance where the jam is. Work it until the flywheel moves freely in both directions.
Remove the obstruction. Use a flashlight to look down into the disposal from above. Use tongs or pliers to pull out the stuck object. Common culprits: small bones, fruit pits (peach, avocado), broken glass, bottle caps, twist ties, and small utensils.
Press the red reset button. On the bottom of the unit. This resets the internal circuit breaker that tripped when the motor stalled.
Test. Turn on cold water, then flip the switch. The disposal should spin freely.

What If It's Not Humming? (Dead Silent)

A disposal that makes no sound at all has a different problem:

Check the reset button first. This is the #1 fix for a silent disposal. Press the red button on the bottom of the unit firmly. If it clicks, the internal breaker had tripped. Test the disposal.
Check the wall switch and breaker. Make sure the switch works and the breaker hasn't tripped.
Check the outlet. Disposals plug into an outlet under the sink. Unplug the disposal and plug in something else (a lamp, phone charger) to verify the outlet has power.
Motor burned out. If the reset, switch, breaker, and outlet all check out and the disposal is completely silent, the motor has failed. Replacement is usually more cost-effective than motor repair — a new disposal installed costs $150—$300 depending on horsepower.

Things You Should Never Put in a Disposal

Grease, oil, or fat — solidifies and clogs the drain line
Fibrous vegetables (celery, asparagus, corn husks) — fibers wrap around the impeller
Pasta, rice, or bread — expands with water and clogs
Eggshells — the membrane sticks to the impeller (despite the myth that they "sharpen" the blades)
Coffee grounds — they look fine going in but accumulate in the drain pipe
Bones larger than chicken wing bones — small bones are fine, large bones jam the flywheel

ðŸ’¡ PRO TIP: KEEP IT CLEAN & FRESH

Disposals develop odor from food buildup on the impeller and inside the grind chamber. Fix: Drop a few ice cubes and a handful of coarse salt into the disposal and run it for 15 seconds. The ice and salt scrub the impeller and chamber walls. Follow with half a lemon for a fresh scent. Do this weekly. In Florida's heat and humidity, disposal odor builds faster — this maintenance makes a noticeable difference.

Repair vs. Replace a Garbage Disposal

Disposals are inexpensive appliances ($75—$250 for the unit). If the motor has burned out, replacement is almost always the better choice over repair. A technician can install a new disposal in under an hour. The labor is the same whether we're repairing the old one or installing a new one — so you might as well get a fresh unit with a full warranty. If the disposal is under 5 years old and the issue is just a jam, fix it. If it's 8+ years old with a burned motor, replace it.

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