Breville Grinder Not Working? 6 Fixes That Work

Why a Breville Grinder Stops Grinding

On a Barista Express or Barista Pro, a grinder that runs but gives no coffee has three causes in Breville's own troubleshooting table: the hopper is empty, the chamber or chute is blocked, or there's water or moisture in the chamber and chute. That last one is why so many grinders stop right after a cleaning. The burrs have to be completely dry before they go back in.

A grinder that won't start at all is usually a hopper that isn't locked. On the Barista Express, the flashing FILTER SIZE lights are how the machine tells you. The fixes below follow Breville's instruction books for the Barista Express (BES870), Barista Pro (BES878), Barista Touch (BES880) and Oracle (BES980), in the order worth trying them.

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Match the Symptom First

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Try This First

• Look in the hopper. "No coffee beans in hopper" is the first cause Breville lists for no ground coffee.
• Lift the hopper off and lock it back on. An unlocked hopper stops the grinder, and beans caught under the lock can stop it seating.
• Check the portafilter is pushed fully into the grinding cradle. On the Express and Pro, pushing it in is what starts the grinder.
• Think back to your last cleaning. If the burrs were washed or wiped wet, go straight to Fix 3.
• Switch the machine off and on. If it had simply stopped, give it time to cool (Fix 5).

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Fix 1: Fill the Hopper and Lock It On (Works About 30% of the Time)

The grinder won't run with the hopper unlocked, and it can't grind from an empty one. On the Barista Express, flashing FILTER SIZE lights mean the bean hopper isn't attached correctly. The Barista Pro's screen has a LOCK HOPPER icon for the same thing.

Signs it's this one: no motor at all, flashing FILTER SIZE lights or a LOCK HOPPER message, or the motor runs and stops almost immediately.

1. Lift the hopper off the machine.
2. Check the underside and the lock area for loose beans or debris. Breville's instruction is to "remove hopper, check for debris and then re-lock hopper into position."
3. Fill it with fresh, roasted whole beans.
4. Seat it, turn it to lock, and make sure it sits flush.
5. Push the portafilter into the cradle to grind.

Time: 2 minutes
Cost: Free
Success Rate: About 30%
Difficulty: Easy

Oracle (BES980): "Unable to lock bean hopper into position" means coffee beans are obstructing the locking device. Remove the hopper, clear beans from the top of the burrs, then re-lock it.

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Fix 2: Run Breville's Grinder Cleaning Cycle (Works About 20% of the Time)

Coffee oils coat the burrs and slow the flow of grounds, especially with dark, oily roasts. Breville describes its cleaning cycle as removing "oil build-up on the burrs which can impede performance". It's also the book's answer to a grinder making a loud noise: "Remove hopper, check for debris or blockage. If necessary, clean and clear grinder chamber and chute."

Signs it's this one: grinding has got slower over weeks, the dose is lighter than it used to be, or the grinder sounds rough.

1. Unlock the hopper and empty the beans into an airtight container.
2. Put the empty hopper back and lock it.
3. Run the grinder empty to clear the beans still in the burrs.
4. Unlock and remove the hopper.
5. Unlock and lift out the top burr.
6. Brush the top burr, the lower burr and the chute with the cleaning brush.
7. Refit the top burr and lock it, then refit and lock the hopper.

⚠️ Safety: "Care should be taken as the grinder burrs are extremely sharp." Brush them; don't wipe them with your fingers.

Time: 10 minutes
Cost: Free
Success Rate: About 20%
Difficulty: Easy

Keep it dry. The steps use a brush only. If you wash any part, dry it completely before it goes back (Fix 3).

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Fix 3: Dry the Burrs After Cleaning (Works About 15% of the Time)

If your grinder stopped working right after a clean, this is the fix Breville lists by name. "Water / moisture in grinder chamber and chute" is its own cause of no ground coffee. Damp grounds cake onto the burrs and pack the chute.

Signs it's this one: the motor runs but nothing comes out, and the grinder was washed, wiped with a wet cloth, or reassembled damp.

1. Remove the hopper and the top burr.
2. Brush out any caked, damp grounds from the burrs and the chute.
3. Let the burrs dry thoroughly before reassembling. Breville says "It is possible to use a hair dryer to blow air into the grinder chamber" to speed it up.
4. If the chute is packed solid, clear it with Fix 4.
5. Reassemble and grind a test dose.

Time: 15-30 minutes, mostly drying
Cost: Free
Success Rate: About 15%
Difficulty: Easy

Oracle: the same advice appears for a "loud racket" noise caused by "moisture clogging grinder": leave the burrs to dry thoroughly, and a hair dryer can speed it up.

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Fix 4: Advanced Cleaning for a Blocked Chute (Works About 12% of the Time)

When a blockage sits between the burrs and the grinder outlet, the normal cleaning cycle doesn't reach it. Breville's advanced cleaning takes the lower burr out so you can clear the exit chute. It's in the Barista Express and Barista Pro books, and it needs a 10 mm socket and long-nose pliers.

⚠️ Safety: unplug the machine before you start. The burrs are extremely sharp.

1. Remove the hopper. Set GRIND SIZE to 1 (finest).
2. With a 10 mm socket, turn the nut clockwise to loosen it only.
3. Set GRIND SIZE to the coarsest setting (16 on the Barista Express, 30 on the Barista Pro).
4. Unlock and remove the top burr.
5. Remove the nut, spring washer and flat washer, then carefully lift out the lower burr.
6. With long-nose pliers, remove the grind fan and the washers beneath it.
7. Unblock the grinds exit chute with the brush or a pipe cleaner.
8. Refit in order: felt washer, metal washer, grind fan. Insert the lower burr with its drive pin in the cavity, then the flat and spring washers.
9. Tighten the nut counter-clockwise. Insert and lock the top burr.
10. Set GRIND SIZE back to 5 (Express) or 15 (Pro), refit and lock the hopper.

Time: 20-30 minutes
Cost: Free (a 10 mm socket and long-nose pliers)
Success Rate: About 12%
Difficulty: Moderate
Tools: 10 mm socket, long-nose pliers, cleaning brush or pipe cleaner

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Fix 5: Let It Cool After a Thermal Cut-Out (Works About 10% of the Time)

The Barista Express and Barista Pro have a safety thermal cut-out that "may have activated due to the pump or grinder overheating". When it trips, the machine is on but stops working.

1. Press POWER to switch the machine off.
2. Unplug it.
3. Let it cool for about 30-60 minutes.
4. Plug in, switch on and try again.
5. If it keeps happening, Breville's instruction is to call Breville Consumer Support.

Time: 30-60 minutes
Cost: Free
Success Rate: About 10%
Difficulty: Easy

Barista Touch (BES880): the same thermal cut-out row appears in its book, with the same off, unplug and cool advice. Our Barista Touch not working guide covers that machine's other stops.

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Fix 6: Adjust Grind Amount, Grind Size or the Upper Burr (Works About 8% of the Time)

If the grinder works but gives too much or too little coffee, it isn't broken. The settings don't match your beans. Breville's row for this is "Grind amount settings are incorrect for particular grind size."

1. Grind amount: turn the GRIND AMOUNT dial (Express) or change the grind time (Pro) to increase or decrease the dose. The Pro's defaults are 9.5 seconds for a single and 13 seconds for a double.
2. Grind size: the smaller the number, the finer the grind. The Pro has 30 settings with a default of 15, and its screen shows a faster/slower pour bar as you turn.
3. Filter size: on the Express, press FILTER SIZE to match the basket (single or double).
4. Extend the range (Barista Express only): the upper burr is adjustable for coffees that need a wider grind range. Empty the hopper and run the grinder empty, remove the upper burr, pull out its wire handle, move the burr one number finer or coarser, refit the handle and lock the burr. Breville recommends "making only one adjustment at a time".

Time: 5-15 minutes
Cost: Free
Success Rate: About 8%
Difficulty: Easy

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Model Differences

Oracle extras: if the grinder runs continuously, there are either no beans or the tamping fan has been removed. To stop it, rotate the portafilter to the left (the emergency stop), and check the tamping fan is mounted on its drive shaft. An ERR message means "a fault has occurred": contact Breville.

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When DIY Won't Work

Stop and unplug it if the grinder smells hot, you hear metal on metal after clearing it, or the thermal cut-out trips again straight after cooling.

Call Breville Consumer Support when:

• The thermal cut-out keeps tripping after a 30-60 minute cool-down
• The motor hums but won't turn with the hopper and burrs clear
• An Oracle shows ERR

Warranty and parts: check the warranty booklet that came with your machine for the length that applies where you bought it. The books don't give burr part numbers or a burr replacement interval, so get replacement parts from Breville for your exact model.

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Prevention

• Run the grinder cleaning cycle regularly, and more often with dark, oily roasts.
• Keep water out of the grinder. Brush, don't wash; dry anything that got wet before reassembly.
• Lock the hopper every time you refit it.
• Use roasted beans only. Breville warns that unroasted green beans "will damage or break burr grinders and even pose a safety risk".
• Grind fresh beans (the books suggest using them 5-20 days after the roast date) and store the rest airtight.

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FAQ

Why is my Breville Barista Express grinder not working after cleaning?

Most likely there's moisture in the burrs or chute. Breville lists "water / moisture in grinder chamber and chute" as a cause of no ground coffee. Take the top burr out, clear any caked grounds, let everything dry completely (a hair dryer is allowed), and reassemble. If the chute is packed, use the advanced cleaning in Fix 4.

Why are the FILTER SIZE lights flashing on my Barista Express?

The bean hopper isn't attached correctly. Breville's fix is to remove the hopper, check for debris, and lock it back into position. It isn't a fault code, and the grinder won't run until the hopper is locked.

Should I change the grind size or the grind amount first?

It depends on the shot. Breville's extraction chart pairs them: a shot that runs too fast wants a finer grind or a bigger grind amount, and one that runs too slow wants a coarser grind or a smaller amount. Change one thing at a time and pull another shot before changing the next.

Why is my Breville grinder so loud?

Breville's row for a loud grinder is "blockage or foreign object in grinder". Remove the hopper, look for debris or a stray object, and clean the chamber and chute. On an Oracle, a loud "racket" can also mean moisture clogging the grinder.

Does the Barista Pro grind differently from the Barista Express?

The mechanism and cleaning are the same, but the controls differ. The Pro has 30 grind settings shown on its LCD, times the dose in seconds (9.5 and 13 by default), and shows LOCK HOPPER on screen. The Express uses a GRIND AMOUNT dial, a FILTER SIZE button, and flashing lights for an unlocked hopper.

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Related Breville Fixes

• Breville Error Codes and Warning Lights
• Breville Grinder Burr Replacement Guide
• Breville Steam Wand Not Working
• Breville Barista Touch BES880 Not Working

Sources: Breville instruction books for the Barista Express (BES870 USCM V23), Barista Pro (BES878), the Barista Touch (BES880 ANZ K22) and Oracle (BES980).