OXO Compact Conical Burr Coffee Grinder Not Working? How to Fix It

Your grinder worked fine yesterday. Today you press the button and get a hum, a rattle, or nothing at all. That’s the classic OXO compact conical burr coffee grinder not working moment. The cause is usually a jam or a seating problem, not a dead motor.

This guide helps you match the symptom to the fix. It also covers when to stop and contact OXO. This article is for the compact model 8720800, which holds 50 grams of beans. Own the larger 12 oz OXO Brew grinder instead? Start with our complete OXO coffee grinder guide.

What’s Actually Wrong With Your OXO Compact Grinder?

Match what the grinder does to the table before you take anything apart. Most OXO compact conical burr coffee grinder not working problems fall into one of four symptoms. Unplug the grinder before you open anything.

Symptom	Likely cause	Where to go
Nothing happens	Power problem, or hopper or grounds container not seated	“Why Won’t the Grinder Turn On at All?”
Motor hums, no grinding	Jammed burrs, packed grounds, or a setting that’s too fine	“What If It Hums but Won’t Grind?”
Stops mid-grind	Clumped oily beans or a jam	“What If It Hums but Won’t Grind?”
Uneven or off-size grounds	Oily buildup or an upper burr that isn’t seated flat	“What If It Hums but Won’t Grind?”

Here’s the catch. Troubleshooting advice written for OXO’s larger grinders often says to brush the grounds chute. The compact is chuteless, so that step doesn’t exist here. A no-grounds problem lives at the burrs instead.

Keep water off the burrs, too. Rinsing feels like the obvious fix, but wet steel rusts and damp grounds stick to it. Brush the burrs dry.

Why Won’t the Grinder Turn On at All?

A silent grinder is almost always a power or seating problem. OXO’s troubleshooting table for this grinder lists a missing plug and a hopper or grounds container that isn’t seated. Work through these in order:

1. Plug a lamp or phone charger into the same outlet.
2. Look over the cord and plug for kinks or damage.
3. Remove the hopper.
4. Set it back on and turn it until it seats fully.
5. Push the grounds container into place until it seats fully.

Step four feels too simple to matter. It catches people most often right after a cleaning, when the hopper goes back on slightly off and nothing looks wrong.

If the cord or plug is damaged, stop right there. OXO’s safety instructions for its Brew grinders say to stop using a damaged appliance and call customer service.

If the outlet, cord, and seating all check out and the grinder stays silent, you’re likely looking at the motor or base. OXO’s replacement parts for this model are the upper assembly, the grounds cup, and a spray bottle for static. A motor or base isn’t offered, so a dead motor is a warranty or replacement conversation.

What If It Hums but Won’t Grind?

A hum with no grinding means the burrs aren’t turning or the beans aren’t reaching them. The usual causes are a jam, clumped oily beans, or a setting that’s too fine. Clear the jam first, then adjust the setting.

Clear a burr jam

The upper and lower burrs on this model come apart for brushing, which makes the job easier than it sounds.

1. Unplug the grinder.
2. Pour out any beans left in the hopper.
3. Remove the hopper.
4. Take out the upper burr, following your manual.
5. Brush the packed grounds off both burrs with a dry bristle brush.
6. Press the upper burr back in until it sits flat.
7. Reattach the hopper until it seats fully.
8. Plug in and run a small handful of beans.

Don’t rush step six. A burr that isn’t fully seated gives uneven grounds or a hum with no grinding at all. For the full routine, see our guide on how to clean the OXO Brew compact conical burr coffee grinder.

Check the grind setting

The dial offers 15 settings plus 29 micro-adjustments. The finest settings make the motor work hardest. If it bogs down, go one step coarser and test again. Once it runs smoothly, I’d work back toward finer one step at a time.

Oily beans and clumping

Dark, oily roasts are where this grinder gets cranky. The oils make beans clump and grounds cling to the burrs. The motor strains, and the grounds come out damp and clumpy instead of fluffy. OXO’s own troubleshooting table lists oily beans as a cause of slow or inconsistent grinding.

It shows up most when you switch from a light roast to a dark one. A 50-gram hopper is small, so one clump can interrupt the feed. Unplug the grinder, stir the beans gently, and brush the burrs sooner than you normally would.

Why Does It Often Stop Right After a Cleaning?

This is one of the most common patterns with conical burr grinders. A grinder runs well for months. It starts to feel sluggish, so the owner takes it apart for a deep clean.

Afterward, the motor hums and no grounds come out. The burrs look spotless, which is the confusing part.

The upper burr usually went back in slightly off, not flat. The fix is to unplug the grinder and open it again. Press the burr fully into place, reassemble, and normal grinding returns. After any cleaning, confirm the burr sits flat before you close everything up.

How Do You Keep It From Failing Again, and When Should You Contact OXO?

Brush the burrs regularly and go easy on oily beans. Stop troubleshooting if the motor still won’t spin after you’ve cleared a jam. A persistent OXO compact conical burr coffee grinder not working problem after a full cleaning is a job for OXO.

Routine care

• Brush the burrs every week or two with a dry brush. Do it weekly if you drink dark roasts.
• Hand wash the grounds container, as OXO specifies.
• Check your manual before using grinder-cleaning tablets between teardowns.
• Fill the hopper with what you need. It holds 50 grams, enough for up to six cups (30 oz) of brewed coffee.

Stop and contact OXO if you notice

• A burning smell.
• A motor that won’t spin after you’ve cleared the jam.
• A cracked housing or a damaged cord.

OXO’s manuals for its Brew grinders set a two-year warranty against manufacturing defects. It covers appliances sold new and used in the U.S. and Canada. Confirm the term in your compact manual. During the warranty, don’t return a faulty grinder to the store. OXO says to visit oxo.com, call (800) 545-4411, or email info@oxo.com.

One more catch: those same manuals void the warranty if someone other than OXO attempts a repair or if non-OXO parts are used. Brushing the burrs is routine care. Opening the motor housing is not.

For repair versus replace, OXO lists the compact grinder at $79.99, and retail prices run from about $80 to $100. Check the price of the replacement part you need on oxo.com against that number before you decide.

FAQ

Does cleaning void the OXO warranty?
Not by itself. Brushing the burrs is normal care. What puts coverage at risk is a repair by someone other than OXO, or non-OXO parts. Take photos of the problem before you contact OXO.

Can I buy replacement parts for this model?
Yes. OXO sells a replacement upper assembly, which includes the hopper lid, upper housing with burr, and removable lower burr. It also lists a replacement grounds cup. Both are listed for the 8720800 compact grinder only, so don’t order parts meant for the larger Brew.

Is it worth repairing, or should I replace it?
If a brush-out or a re-seated burr fixes it, repair wins easily. If the motor is dead and the warranty has expired, I’d compare a replacement part’s price to a new grinder. A part that costs close to half the price of a new unit usually isn’t worth it.

Are the hopper and grounds container food safe?
OXO makes both from Tritan Renew, which it describes as a food-safe plastic made from certified recycled content. Hand wash the grounds container. Check your manual for OXO’s food-contact statement if you need a specific claim like BPA-free.

Can I use water, rice, or a vacuum to clean it?
Keep water off the burrs. I’d skip rice, because a dry brush does the job without risking the burrs. A small vacuum around the burr area works if the grinder is unplugged.