By the Peoria AZ Plumbing Co team · Published 2026-09-01 · Updated 2026-09-18
A garbage disposal that hums but does not spin is almost always jammed, not dead, and the fix takes under five minutes. First, cut power to the unit at the wall switch. Then look underneath the disposal for a small hexagonal hole and insert a hex key, often included with the unit, or a standard 1/4-inch Allen wrench, to manually rotate the flywheel and free whatever is stuck. Afterward, press the small red reset button on the bottom of the unit before restoring power and testing again.
Dealing with this right now? This guide covers the background. For the actual repair, our Garbage Disposal Repair & Installation page has what to expect from a visit, or call (623) 323-3182 to talk it through directly.
The hex key method, step by step
With power off at the switch, look at the bottom center of the disposal unit for a small hexagonal opening. Insert the hex key and turn it firmly in both directions to work the flywheel loose from whatever is jamming it, usually something rigid like a fruit pit, bone fragment, or piece of glass that got in accidentally.
Once it turns freely, remove the key, press the reset button, restore power at the switch, and run cold water while testing the disposal briefly. If it spins normally now, the jam is cleared.
What causes the jam in the first place
Fibrous produce like celery or corn husks can wrap around the flywheel rather than being cut cleanly, and hard items like fruit pits, bone fragments, or utensils that accidentally fall in are common rigid obstructions. Peoria's very hard water also leaves mineral scale inside the unit over time, which can make an otherwise minor jam feel more severe than it would in a softer-water city.
Running the disposal with a strong flow of cold water, rather than hot, helps solidify grease so it gets chopped and flushed through rather than coating the mechanism.
When it is not a jam at all
If the disposal is completely silent, not even humming, when you flip the switch, check the breaker panel before assuming the unit itself has failed; a tripped breaker produces exactly this symptom. If the breaker is fine and it is still silent, the motor itself may have failed, which typically means replacement rather than repair.
Water leaking from the bottom of the unit, as opposed to the plumbing connections above it, means the housing has failed internally and is also a replacement situation rather than something to attempt to seal.
Preventing repeat jams
Avoid putting bones, fruit pits, fibrous vegetable scraps, and grease down the disposal regularly, since all of these are common repeat-jam causes. Running cold water for a few seconds before and after each use helps flush material through rather than letting it settle and interact with the mineral scale that builds inside the unit over time.
If jams are becoming frequent despite reasonable use, and the unit is several years old, it may simply be reaching the point where a new, correctly sized unit makes more sense than continuing to clear the same problem repeatedly.
The bottom line
Most disposal jams are a two-minute fix with a hex key, which makes it worth trying before assuming the unit needs replacing or scheduling a service call.
Save the replacement conversation for a unit that is leaking, completely silent even with confirmed power, or jamming on a genuinely frequent basis despite reasonable use.
Choosing a replacement unit's horsepower
Disposal horsepower ranges from roughly one-third to one horsepower for residential units, and a busier kitchen that processes more food waste generally benefits from the higher end of that range rather than the cheapest available option.
A plumber installing a replacement can advise on the right horsepower for your household's actual cooking habits rather than defaulting to whatever unit happens to be in stock.
| Symptom | Likely cause | Try this |
|---|---|---|
| Humming, not spinning | Jammed flywheel | Hex key from underneath, then reset button |
| Completely silent | Tripped breaker or dead motor | Check breaker first, then consider replacement |
| Leaking from the bottom | Failed internal housing | Shut off and plan for replacement |
| Frequent repeat jams | Wrong materials going down, or unit aging | Adjust use, or consider replacement |
Frequently asked questions
Is it safe to use the hex key method myself?
Yes, as long as power is off at the wall switch first. Never put your hand inside the disposal itself, even when it appears off, and use the hex key or a tool rather than fingers to clear any obstruction.
Why does my disposal keep jamming on the same type of item?
Fibrous produce and rigid items like fruit pits are common repeat offenders because they either wrap around the flywheel or resist being cut cleanly. Avoiding those specific items reduces jam frequency significantly.
Where is the reset button located?
Usually a small red or black button on the bottom of the disposal unit, near the hex key opening. Pressing it after clearing a jam is often necessary before the unit will run again.
Is a jammed disposal a sign it needs replacing?
Not necessarily. Occasional jams are normal wear and tear. Frequent jams on a unit that is several years old, combined with reduced grinding power, can indicate it is nearing the end of its useful life.
Is a hex key included with every disposal?
Many units ship with one attached to the unit itself or included in the box, but a standard 1/4-inch Allen wrench from any hardware store works as a substitute if the original has been misplaced.
Can I install a new garbage disposal myself, or should I hire a plumber?
A comfortable DIYer with basic electrical and plumbing knowledge can sometimes install a straightforward like-for-like replacement, though working with the electrical connection and ensuring a proper seal against future leaks are the two areas where mistakes are most costly. Many homeowners find the modest cost of professional installation worthwhile for the assurance it was done correctly.
Do all disposals have a manual reset button?
Most standard residential units do, though its exact location varies by manufacturer. If you cannot locate one on your specific model, checking the manufacturer's documentation or a quick search by model number usually clarifies where to find it.
Is it worth upgrading to a disposal with a stainless steel grinding chamber?
Stainless steel components generally resist corrosion better than galvanized alternatives, which can matter over time given Peoria's water chemistry, though the practical difference is more about longevity than day-to-day performance.
Reviewed by the Peoria AZ Plumbing Co team. Our work follows the International Plumbing Code (IPC) and the International Fuel Gas Code (IFGC) as adopted regionally, plus the permit and inspection requirements of the City of Peoria and Maricopa County.