Why is my garbage disposal humming but not working?
A humming disposal that won't spin has something jammed in the flywheel — usually a bone, bottle cap, or utensil. The hum is the stalled motor trying to turn. Cut power, clear the jam, use the hex-wrench port on the bottom to free the plate, and it usually lives. A disposal that leaks from the bottom or keeps tripping its reset is done: replacement, not repair.
Likely causes
- Jammed flywheel — Hard debris locks the plate; the hum is the stalled motor.
- Tripped reset or breaker — The disposal's own overload switch pops to protect the motor — that version is silent, no hum.
- Worn seals (leaking from the bottom) — Bottom leaks mean the internal seal failed — disposals aren't rebuilt; replace.
- Dead motor — No sound at all with power confirmed — the unit has failed.
What you can check yourself
- Power OFF at the switch and breaker. Never reach inside with your hand — use tongs or pliers to fish debris out through the drain opening.
- Insert an Allen wrench (usually 1/4 inch) in the hex socket on the unit's bottom and work it back and forth to free the jam.
- Press the red reset button on the bottom, restore power, run cold water, and test.
Typical cost
A plumber's repair visit in San Francisco, CA typically runs $150–$300 if it's just a jam or reset. Disposal replacement runs $250–$600 installed depending on horsepower and brand.
When to call a pro
Leaks from the bottom of the unit, repeated breaker trips, or a jam you can't free — call. Water plus a failing electrical appliance under the sink is not a wait-and-see.
Plumber pros in San Francisco, CA
- Ace Plumbing & Rooter, Inc. · 1090 Bryant St, San Francisco, CA · (415) 824-6444
- Cornely Company · 174 Shotwell St, San Francisco, CA · +14152521800
- J E Brown Co Mechanical Contractors · 78 Shotwell St, San Francisco, CA · 14156264044
- Starboy Plumbing Inc. · 1580 Folsom St, San Francisco, CA · 14157122557
- Hydra Ventures Inc · 214 12th St, San Francisco, CA · 14152528600
- EVERLAST PLUMBING · P O BOX 884181, SAN FRANCISCO, CA · (415) 739 7009
- Zec and Ros Plumbing · 939 Buchanan St, San Francisco, CA · +14158023334
- Aqua Star Plumbing · 147 Graystone Ter, San Francisco, CA · +14159702280
Get free quotes from San Francisco, CA pros →
Data by Servik — verified local pros from official license records and public sources. Cost figures are typical ranges, not quotes; a pro's written estimate is the real number.