Garbage disposal not working? Humming, jammed, or dead
Quick answer
What the disposal does tells you the problem. If it hums but won't spin, it's jammed — cut the power, then free the impeller with the hex key in the slot under the unit (or turn it from the top with a wooden spoon). If it's totally silent, it's electrical: press the red reset button on the bottom, and check the outlet and breaker. The one unbreakable rule: never put your hand in the disposal, and always switch it off before reaching near it.
Common causes
- A jam — bone, fibrous food, or a utensil stuck against the impeller (the cause of humming).
- A tripped internal reset button after an overload.
- No power — a tripped breaker, a GFCI outlet that needs resetting, or a wall-switch issue.
- A failed motor at end of life (silent, no hum, reset doesn't help).
- A leak at the mounting, hose, or housing.
What to check first
- Switch the disposal OFF (and ideally unplug it or kill its breaker) before doing anything near it.
- Humming but not spinning: insert the hex/Allen wrench into the slot on the underside and work it back and forth to free the jam.
- Silent: press the red reset button on the bottom of the unit, then try again.
- Still dead: check the breaker and any GFCI outlet under the sink or nearby.
- Look underneath for drips that point to a leak rather than a motor problem.
When it's urgent
This is a safety-first repair, not an emergency. Never reach into the disposal with your hand, even when it's off — use tools. Stop immediately if you smell burning or see an electrical issue, and call an electrician. A leak under the sink isn't urgent but will damage the cabinet if ignored.
DIY vs. call a pro
You can likely DIY
- Pressing the reset button and checking the breaker/GFCI.
- Freeing a jam with the hex key (power off).
- Clearing debris you can see and reach with tongs (never your hand).
Call a pro for
- Persistent leaks at the housing or plumbing connections.
- Replacing a dead unit if you're not comfortable with the wiring and plumbing.
- Any electrical fault — a burning smell or repeated breaker trips.
Estimated cost range
How HouseCue helps
HouseCue is a private, homeowner-first app that turns this from a one-time worry into a tracked plan. Snap a photo for an AI diagnosis, upload your inspection report to auto-build a handbook, and get seasonal reminders for your roof, HVAC, water heater, plumbing, and electrical — so nothing slips. Connecting with a pro is always optional and only when you choose.
Get started freeFrequently asked questions
Why is my garbage disposal humming but not working?
It has power but the impeller is jammed. Turn it off, then use the hex/Allen wrench in the slot on the bottom of the unit to rock the motor free, or turn the blades from the top with a wooden spoon. Clear the obstruction before turning it back on. Leaving it humming can burn out the motor.
Where is the reset button on a garbage disposal?
It's a small red (sometimes black) button on the underside of the unit. After an overload the disposal trips and goes silent; pressing the button resets it. If it trips again right away, there may be a jam or a failing motor.
Is it safe to put my hand in the garbage disposal?
No — never, even with the power off. Use the hex key, tongs, or pliers to clear anything inside. Accidental activation or a sharp impeller can cause serious injury.
Related guides
HouseCue guides are general educational information, not professional inspection, engineering, or contracting advice. Costs vary by market. For safety issues — gas, electrical, structural, or major water — contact a qualified professional.