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Garbage Disposal Humming but Not Spinning? Here's the Fix

A garbage disposal that hums but won't spin is jammed; one that's totally silent has tripped. Here's how to safely fix both — usually in a few minutes, no plumber.

3 min read

A garbage disposal that hums but won't grind and one that's completely silent are two different problems with two easy fixes — and you almost never need a plumber for either. The trick is reading which one you have, and always cutting the power before you reach in.

Safety first, always. Before touching the disposal, turn the switch off and unplug it (the cord is under the sink) or shut off its breaker. Never put your hand into the disposal, powered or not.

If it hums: it's jammed

A humming sound with no grinding means the motor has power but the rotor is stuck — usually on a bone, fruit pit, a stray utensil, or fibrous scraps wedged between the impellers and the grinding ring. Leave it humming and it'll overheat and trip, so cut the power and free it:

  1. Use the hex wrench. Most disposals include a small hex (Allen) wrench that fits a slot in the center of the unit's bottom. Insert it and work it back and forth until the rotor turns freely.
  2. Or work from the top. With the power off, use the handle of a wooden spoon to push against the impellers and rock them loose. Never use your hand.
  3. Remove the culprit. Once it spins freely, fish out whatever caused the jam (with the power still off).

If it's silent: it tripped

A dead, silent disposal has tripped its internal overload protector. Look on the bottom of the unit for a small red reset button that has popped out. Let it cool a few minutes, then press it firmly back in. If it won't stay, give it more time to cool and try again.

Still nothing? Check the power

If it's silent and the reset button won't help, the disposal may not be getting power at all:

If it has power, isn't jammed, and the reset is in but it still does nothing, the motor has likely failed and the unit needs replacing.

Restore power and test

Turn the power back on, run cold water, and switch the disposal on. It should spin and clear normally.

Keep it from jamming again

Most jams are avoidable with a few habits:

  • Run cold water before, during, and for a few seconds after every use.
  • Keep out bones, fruit pits, fibrous scraps (celery, corn husks, onion skins), grease, and hard items.
  • Feed it gradually, not in one big load.

For related kitchen-plumbing issues, see why your dishwasher won't drain (the two often share a drain) and how to unclog a slow drain. For the bigger picture, see preventive home maintenance.

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Frequently asked questions

Why is my garbage disposal humming but not spinning?+
A humming sound with no grinding means the motor is getting power but the rotor is jammed — usually by a bone, fruit pit, utensil, or fibrous scraps stuck between the impellers and the grinding ring. The motor can't turn, so it just hums, and if you leave it on it will overheat and trip. Cut the power, then free the jam by turning the rotor with the hex wrench in the slot underneath, or by gently working it from the top with a wooden spoon handle — never your hand.
Where is the reset button on a garbage disposal?+
It's a small button, usually red, on the bottom center of the disposal unit under the sink. When the disposal overloads or overheats, an internal breaker pops out and cuts power, leaving it completely silent. After clearing any jam and letting it cool for a few minutes, press the reset button firmly back in. If it won't stay in, give it a few more minutes to cool, then try again.
How do I unjam a garbage disposal safely?+
Always cut the power first — flip the switch off and unplug the unit or turn off its breaker. Never put your hand in the disposal. Most units come with a small hex (Allen) wrench; insert it into the hex slot in the center of the unit's bottom and work it back and forth until the rotor turns freely. Alternatively, use a wooden spoon handle from the top to nudge the impellers. Once it moves freely, remove whatever caused the jam, restore power, and press the reset button if needed.

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