Garbage Disposal Not Working? Common Causes and Quick Fixes

Garbage disposals fail in three ways: silent, humming, or leaking. Here's how to diagnose what yours is doing — and the quick fix you can usually try yourself before calling a plumber.

1. The disposal is completely silent

No hum, no click. 90% of the time this is the reset button. Look on the bottom of the unit for a small red or black button. Push it firmly until it clicks and stays in. Try the disposal again.

Still nothing? Check the breaker in your panel labeled "kitchen" or "disposal." If the breaker is fine and the reset button won't stay in, the motor is done — usually a replacement, not a repair.

2. The disposal hums but doesn't spin

Something is jammed. Shut off the switch first. Look under the disposal — most have a hex slot in the center of the bottom. Insert the small allen wrench that came with the unit (or a 1/4" hex key) and turn it back and forth a few times to free the impellers. Press the reset button. Try the disposal again.

If you didn't keep the wrench, any hardware store sells one for $3. Never put your hand inside a disposal, even with the power off.

3. The disposal is leaking

Leaks come from three places and the location tells you the fix:

• Top, where the disposal meets the sink: sink flange seal is bad. Re-seal with plumber's putty.
• Side, where the dishwasher hose connects: hose clamp loose or hose cracked.
• Bottom of the unit: internal seal failed. Replace the disposal.

4. The disposal runs but doesn't drain

Not the disposal — the drain line under the sink is clogged. Remove the P-trap, clean it out, reinstall. If it clogs again within a week, the branch line is the issue and needs to be snaked.

What kills garbage disposals fastest

• Grease — coats the impellers and the drain line.
• Fibrous food — celery, onion skins, potato peels wrap around the blades.
• Starchy food — pasta and rice swell and clog.
• Coffee grounds — pack into a paste at the bottom of the trap.
• Bones, fruit pits, eggshells — dull or chip the impellers.

Run cold water 10 seconds before, during, and after every use. That's the single best thing you can do for the life of the unit.

When to call us

If the reset button won't stay in, the unit leaks from the bottom, or you can hear the motor running but smell something burning — it's time to replace, not repair. A new mid-tier 3/4 HP disposal installed in Norwalk runs $325–$575. Call (562) 521-4995. Sigma Plumbing & Rooter answers 24/7 across Norwalk, Cerritos, Downey, Bellflower, Lakewood, Long Beach, and surrounding LA & OC cities.