Garbage Disposal Not Working? How to Fix a Humming, Dead, Leaking, or Smelly Unit

Your garbage disposal picks the worst moment to quit. The sink is full of dishes, and now it hums, sits there dead, drips under the cabinet, or smells like last week's dinner. The good news is that most disposal problems come down to a short list of causes, and several of them you can fix yourself in a few minutes without a plumber. This guide walks through the four things that go wrong most often, exactly what to do about each one, and how to tell when the unit is finished and needs replacing.

Before You Touch It: Kill the Power

This is the one step you never skip. Before you look inside a disposal or reach anywhere near the drain opening, turn it off at the wall switch, then unplug it under the sink or flip its breaker in the panel. A jammed disposal can free itself and jump to life the instant it gets power, so switching it off is not enough on its own. And no matter what, never put your hand or fingers down into the disposal. The grinding parts are sharp even when the motor is off. If something needs to come out, use kitchen tongs or needle-nose pliers, not your hand.

It Hums but Won't Spin: You Have a Jam

A humming sound means the motor is getting power but the grinding plate is stuck on something. Bones, fruit pits, popcorn kernels, a stray fork, or twist ties are the usual culprits. Do not keep flipping the switch to force it — that can burn out the motor. Work through these steps instead.

1. Cut the power. Turn the disposal off at the switch, then unplug it under the sink or flip its breaker. This is the step that keeps your hand safe.
2. Look inside with a flashlight. If you can see what is jamming it, pull it out with tongs or needle-nose pliers — never your fingers.
3. Free the flywheel from below. Most disposals have a hex-shaped hole in the center of the underside. Fit the hex wrench that came with your unit into it and rock it back and forth until it turns a full, free circle.
4. No wrench hole? Some models turn from the top. With the power still off, press the handle of a wooden spoon against one of the grinding blades and lever it back and forth to work the jam loose.
5. Restore power and reset. Plug it back in, press the red reset button on the bottom of the unit, run cold water, and switch it on for a second to confirm it spins freely.

If it still only hums after you have cleared the jam and turned the flywheel by hand, stop there. A motor that will not turn under its own power usually has an internal fault, and that is a job for a plumber rather than another round of DIY.

It's Completely Dead: Reset Button and Breaker

No sound at all when you flip the switch means no power is reaching the motor. Before you assume the worst, check the two most common causes: the reset button and the breaker. When one of those is the problem, it is often a quick fix.

1. Confirm it is switched on. If the disposal shares a double wall switch with the light, make sure you are flipping the right one.
2. Press the reset button. It is the small red or black button on the underside of the disposal, reachable from inside the cabinet. If it has popped out, push it firmly back in and try the switch again.
3. Check the breaker and any GFCI. Look for a tripped breaker in your panel, and press the reset on any GFCI outlet under the sink or nearby.
4. Test the outlet. If yours is a plug-in model, confirm the outlet under the sink actually has power by testing it with something else, like a phone charger.
5. Give it a minute. If the motor overheated, it may need a short cool-down before the reset button will hold.

If the reset button trips again the moment you turn the disposal on, or it will not stay pushed in, do not keep resetting it. That repeating trip is the unit protecting itself from an electrical fault, and it is a sign to call a pro rather than force it.

It's Leaking or Smelling

Where garbage disposals leak

A drip under the cabinet is easier to diagnose once you know where it is coming from. Dry everything off, run water, and watch for the first bead to form. Where the leak starts tells you how serious it is.

• From the top, where the sink flange meets the drain — usually a worn plumber's putty seal or loose mounting bolts, and often a straightforward fix.
• From the side, where the dishwasher hose or drain elbow connects — often just a loose hose clamp or a cracked gasket.
• From the bottom of the unit — this points to a failed internal seal or a cracked body, and it almost always means the disposal is done and should be replaced.

Getting rid of the smell

A disposal that stinks is usually just food gunk built up inside the grinding chamber and under the rubber splash guard. With the power off, wipe the underside of the splash guard with a sponge. Then, with power back on and cold water running, grind a handful of ice cubes to scour the chamber and finish with a few citrus peels or a spoon of baking soda. If the odor is more of a deep sewer smell that keeps coming back after cleaning, the source is likely further down the drain line than the disposal itself — our separate guide on a smelly kitchen sink walks through those causes.

Repair or Replace? And When to Call Us

A quick unjam or a reset is always worth doing yourself. But some problems are the unit telling you it has reached the end of the road: water leaking from the bottom, a reset button that trips over and over, visible rust, or a disposal you find yourself freeing up every few weeks. Las Vegas hard water speeds this along. Our water, drawn from the Colorado River and Lake Mead, is among the hardest in the country, and the same scale that crusts up your showerheads works away at a disposal's internal seals and metal parts over time, so units here can wear out sooner than the box promises.

When a fix is beyond a flashlight and a hex wrench, that is exactly what our garbage disposal repair and installation service handles. Kingdom Plumbing is a family-owned Las Vegas company with two northwest valley locations, one on West Cheyenne Avenue and one on Farm Road. We are licensed, bonded, and insured under NV Contractors License #0085422, a real person answers the phone 24/7, and every job comes with a flat-rate quote you approve before we start, backed by our 100 percent satisfaction guarantee. Call us at (702) 213-6112 and we will get your kitchen sink working again.

Learn more about our plumbing services in Las Vegas, or call (702) 213-6112.