How to Fix a Broken Garbage Disposal

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9 min read|Updated: Jun 27, 2026|By Home Repair Expert

Quick Answer

A garbage disposal that hums but does not spin is almost always jammed. Turn off the power at the wall switch, insert an Allen wrench (typically 1/4 inch) into the hex socket at the bottom of the unit, and rotate it back and forth to free the rotor. If the disposal is completely dead, press the red reset button on the bottom. Most issues resolve in under 5 minutes.

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A broken garbage disposal, one that hums but does not spin, makes a grinding noise, leaks under the sink, or fails to turn on at all, is one of those kitchen problems that brings the dishwasher and sink to a halt. The good news is that most disposal problems have simple causes you can fix yourself in minutes, often without spending a penny on parts.

This guide explains how a garbage disposal works, the common reasons they fail, and exactly how to safely diagnose and fix each one, while being clear about the steps that mean it is time to call an electrician or plumber.

Common Garbage Disposal Problems

A garbage disposal has only a few moving parts, so failures usually fall into a handful of categories:

• A jam: A fork, bone, or stringy food has stopped the blades from turning. The motor hums but the impeller will not spin.
• A tripped reset button: Most disposals have a thermal overload reset button on the bottom. If it has tripped, the unit does nothing at all.
• A leak at the connections: The sink flange, drain pipe, or dishwasher inlet can loosen and leak underneath.
• A bad switch or wiring: A faulty wall switch or loose wiring can stop the disposal getting power.
• A worn-out motor: After years of use, the motor can fail entirely and need a full unit replacement.

Tools and Materials You Will Need

• Allen key (usually a 1/4 inch hex, often included with the disposal)
• Tongs or pliers (never your hand)
• Flashlight
• Bucket and towels
• Adjustable wrench
• Plumber’s putty (for flange leaks)
• Replacement disposal (if needed)

Step-by-Step: How to Fix a Garbage Disposal

Step 1: Turn Off the Power (Critical)

Switch off the disposal at the wall switch AND unplug it from the outlet under the sink (or trip the breaker if hardwired). Never put your hand into a disposal that has power, even for a moment.

Step 2: Free a Jam From Below

Look at the bottom of the disposal for a hex-shaped hole. Insert the Allen key and turn back and forth firmly to free the impeller. Then shine a flashlight into the drain from above and remove any debris with tongs or pliers, never your fingers.

Step 3: Press the Reset Button

On the bottom of the disposal, find the small red reset button. If it has popped out from overload, press it back in. Then restore power and try the disposal again.

Step 4: Fix a Leak at the Top or Bottom

For a leak at the sink flange (top), drain and remove the disposal, scrape off the old putty, and reseal the flange with fresh plumber’s putty. For a leak at the drain or dishwasher hose, tighten the clamps and connections.

Step 5: Test and Decide About Replacement

Restore power and run cold water while operating the disposal. If it still hums without grinding, the motor has likely failed and the unit needs replacing. Most disposals last 8 to 15 years; replacement is often more economical than repair.

Pro Tips to Prevent This Problem

• Always run cold water while using the disposal, and for 30 seconds afterward, to flush ground food fully down the drain.
• Never put bones, fruit pits, fibrous vegetables (celery, corn husks), or starchy foods (potato peels, pasta) into a disposal.
• Grind a few ice cubes and citrus peel periodically to keep the blades sharp and the unit smelling fresh.

When to Call a Professional

Call a licensed electrician for any wiring issue or hardwired disposal you are not confident working with, and call a plumber if the disposal is leaking from the body itself or if the drain is blocked beyond the unit. For full replacement, many homeowners do this themselves, but if you are unsure about the under-sink plumbing and electrical work, a professional installation gives peace of mind.

Frequently Asked Questions

Why does my garbage disposal hum but not spin?

It is jammed. Turn off the power, then use an Allen key in the hex hole on the bottom to free the impeller, and clear any debris from the drain with tongs (never your hand). Then press the reset button.

Why is my garbage disposal not turning on at all?

The most common cause is a tripped thermal overload, fixed by pressing the red reset button on the bottom of the unit. If that does not help, check the wall switch and breaker.

How long does a garbage disposal last?

A quality garbage disposal lasts 8 to 15 years with regular use and proper care. Avoiding bones, fibrous food, and starchy waste, and running cold water during use, significantly extends its life.

Final Thoughts

A broken garbage disposal is usually fixable in minutes once you cut the power. Free a jam with the Allen key, press the reset button, and tighten or reseal connections to stop leaks. Save the call to an electrician for wiring work, and consider replacing rather than repairing a unit over a decade old. With basic care, your disposal will keep your kitchen running smoothly for years.