A garbage disposal that hums but won’t turn, or does nothing at all, is usually not broken. There are two buttons and one wrench between you and a working disposal, and the order you use them matters.
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First, read the symptom
- Humming but not spinning — power is reaching the motor and something is physically jamming the plate. Do not hold the switch on. Every second of humming is the motor stalled against a blockage, and that is what burns it out.
- Completely silent — no power to the motor. The thermal overload has tripped (reset button), or the breaker went, or the switch/outlet has failed.
- Spins freely but water backs up — the disposal is fine; the drain below it is clogged. Different job — see unclogging a drain.
The reset button
Underneath the unit, usually dead center, there’s a small red (sometimes black) button. That’s the thermal overload reset. When the motor draws too much current — most often because it was jammed — the overload trips and cuts power to protect the windings.
Turn the switch off first, then press it. If it clicks in and stays, it had tripped. If it pops straight back out, or trips again within seconds of running, something is still wrong — don’t keep resetting it. Repeatedly resetting into a fault is how a recoverable jam becomes a dead motor.
Clearing the jam — the right way
- 🔴 Cut the power. Switch off and the breaker. Never put a hand or tool into a disposal that can start.
- Free the plate from below. There’s a hex socket in the center of the underside. Fit the wrench and rock it back and forth — both directions — until the plate turns freely through a full rotation.
- Look inside with a flashlight and remove what caused it with tongs or pliers. Never your fingers, even with the power off.
- Press the reset button.
- Restore power, run cold water, and switch on.
- Garbage disposal un-jam wrench (InSinkErator-compatible) — the purpose-made version of the hex key that came with the unit and is now lost. Keep it taped inside the cabinet door.
A standard 1/4″ hex key works too if yours fits. The dedicated wrench just gives better leverage in an awkward spot. Some units also let you turn the plate from above with a broom handle against the impellers — with the power off, and only if you can’t reach underneath.
What jams them
- Fibrous things — celery, corn husks, artichoke, onion skins. They wrap the plate rather than break up.
- Starchy volume — potato peels and pasta turn to paste and pack solid.
- Bones, fruit pits, and cutlery. A teaspoon is the classic.
- Grease. It doesn’t jam the plate; it congeals downstream and clogs the drain, which people then blame on the disposal.
The habit that prevents most of it: cold water running before, during, and for a few seconds after. Cold keeps fats solid so they get chopped and flushed instead of coating the pipe.
When it’s actually dead
If it hums with a freely-turning plate, trips the reset immediately every time, leaks from the body, or is silent with confirmed power at the outlet — the motor or seals are gone. Replacement is a straightforward swap; picks are in best garbage disposals and the money side is in replacement cost.
Related symptoms worth ruling out: humming but not spinning and disposal not working. If the dishwasher backs up into the sink at the same time, check dishwasher not draining — a disposal installed without knocking out the dishwasher plug is a classic.
FAQ
Where is the reset button on a garbage disposal?
On the bottom of the unit, usually centered — a small red or black button. Switch the disposal off before pressing it.
Why does my disposal hum but not spin?
Something is jamming the plate. Cut the power, free the plate with the hex wrench from underneath, remove the obstruction with tongs, then press reset. Don’t hold the switch on while it hums — that’s what burns out the motor.
My disposal keeps tripping the reset. What now?
Stop resetting it. Repeated trips mean the motor is still overloading — either an unresolved jam or a failing motor. Clear the jam properly first; if it still trips, the unit needs replacing.
Related guides
- Best garbage disposals
- Disposal hums but won’t spin
- Cost to replace a disposal
- How to unclog a drain
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