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.
See a free diagnosis — no signupFrequently 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.