Breville Barista Express Not Working? 7 Fixes (BES870)

The Barista Express Talks Through Its Lights and Gauge

The Breville Barista Express (BES870) has no screen and no error codes, so a few lights and a pressure gauge do the talking. A flashing POWER light means it's still heating, or asleep if it flashes slowly. Flashing FILTER SIZE lights mean the bean hopper isn't locked.

The CLEAN/DESCALE light flashes for a cleaning cycle and stays solid for descale. The gauge shows whether the shot is in the espresso range.

Most "it's broken" moments come down to the machine waiting for something: heat, water, a locked hopper, or a coarser grind. The book's real fault answers are short: the thermal cut-out, and a worn shower screen seal. Work through the fixes in order.

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Try This First

• Check the STEAM/HOT WATER dial is at STANDBY. If it isn't, the machine won't heat up.
• Wait for the POWER light to stop flashing. All the buttons light up when it's ready.
• Push the tank down until it locks, with water in it.
• Look at the FILTER SIZE lights. If they're flashing, re-lock the hopper (Fix 5).
• Note the CLEAN/DESCALE light, and whether it's flashing or solid.

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Match the Symptom

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Fix 1: Let It Heat, With the Dial at STANDBY (Works About 20% of the Time)

The Barista Express only heats with the STEAM/HOT WATER dial at STANDBY. Breville's first troubleshooting row: "Machine does not heat up. STEAM/HOT WATER light flashes when the machine is turned on." Turn the dial to STANDBY and the normal heat-up starts.

Signs it's this one:

• The STEAM/HOT WATER light flashes as soon as you switch on
• The POWER light keeps flashing and the buttons never all light

1. Turn the dial to STANDBY.
2. Wait. POWER flashes while it heats, and a pumping sound is normal.
3. It's ready when POWER stops flashing and every button on the panel lights.

Sleep and Auto Off: after 1 hour unused, the machine sleeps, and the POWER light flashes slowly. After 3 hours it switches off. Wake it with any button except POWER.

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

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Fix 2: Fill and Lock the Water Tank (Works About 20% of the Time)

"Water does not flow from the group head" has two water causes in the book: the tank is empty, or it's not fully inserted and locked. Both also cause a pulsing pump with no water. Breville describes the pulsing itself as normal for its "15 bar Italian pump", but not without water reaching the group head.

Signs it's this one:

• A pumping sound, but little or no water
• The tank was just refilled or knocked

1. Lift the tank out by its handle.
2. Check the water filter holder is locked into the adapter in the tank.
3. Fill with cold water to MAX.
4. Slide the tank back and push down completely until it locks.
5. Press 2 CUP with no portafilter to check water runs.

Time: 2 minutes
Cost: Free
Success Rate: About 20%
Difficulty: Easy

Breville doesn't recommend demineralized or distilled water. If you use filtered or bottled water, the book says to take the water filter out.

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Fix 3: Dial In the Grind Using the Gauge (Works About 25% of the Time)

The BES870's pressure gauge shows three zones. Breville's extraction guide ties each to the shot.

Within the espresso range: flow starts after about 8-12 seconds and the shot takes about 25-30 seconds. Over the range: drips or no flow, over 35 seconds, bitter. Under it: flow like water within 1-6 seconds, under about 20 seconds, sour and weak. Change one thing at a time.

Signs it's this one:

• "Espresso only drips" or "runs out too quickly"
• The needle sits outside the middle zone
• A wet puck after the shot (under-extracted)

1. Start points from the book: GRIND SIZE 5, and the GRIND AMOUNT dial at 3 o'clock.
2. Dose about 16-19 g in the 2 CUP basket and 8-11 g in the 1 CUP, using the Dosing Funnel.
3. Tamp at 22-33 lb (10-15 kg). The top of the tamper cap should be level with the basket rim after tamping.
4. Take the funnel off and trim with the Razor.
5. Drips or over 35 s: go coarser (a higher number) or reduce GRIND AMOUNT.
6. Gushes or under 20 s: go finer (a lower number) or increase GRIND AMOUNT.

Time: 10-20 minutes
Cost: Free
Success Rate: About 25%
Difficulty: Easy

Pre-ground coffee needs the Dual Wall baskets. The book also lists stale beans under "no crema": use beans 5-20 days after the roast date.

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Fix 4: Clear a Blocked Filter Basket (Works About 10% of the Time)

The book's drips-only and no-crema rows both include "the filter basket may be blocked". Old coffee oils and fines close the holes, so water can't pass even with a correct grind.

1. Press 2 CUP with the portafilter out. Good flow there points to the basket.
2. Clear the holes with the pin on the end of the cleaning tool.
3. Still blocked: soak the basket and portafilter in a dissolved cleaning tablet for about 20 minutes, then rinse.
4. From now on, rinse them under hot water after every use.

Time: 5-25 minutes
Cost: Free
Success Rate: About 10%
Difficulty: Easy

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Fix 5: Re-Lock the Hopper and Clear the Grinder (Works About 10% of the Time)

Flashing FILTER SIZE lights have one meaning in the book: "Bean hopper is not attached correctly." Breville's fix is to remove the hopper, check for debris and re-lock it. With no grounds coming out, the other causes are an empty hopper, a blocked grinder chamber or chute, or moisture in the chamber.

1. Remove the hopper, clear any beans or debris from the collar, and lock it back in.
2. Fill it with fresh roasted beans. Never grind green or under-roasted beans, which the book says can break the burrs.
3. No grounds: run the grinder empty, remove the top burr, and brush both burrs and the chute.
4. Still nothing: follow the book's advanced cleaning, with GRIND SIZE at 1, a 10 mm socket turned clockwise to loosen, then GRIND SIZE at 16 to lift out the burr. Clear the chute and rebuild it, then set GRIND SIZE back to 5.
5. After washing parts: dry the burrs completely. Breville allows a hair dryer.

⚠️ Safety: switch off and unplug before removing burrs; Breville warns they're "extremely sharp".

Time: 5-30 minutes
Cost: Free
Tools: Cleaning brush; 10 mm socket for advanced cleaning
Success Rate: About 10%
Difficulty: Moderate

More grinder detail is in our Breville grinder guide.

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Fix 6: Clean or Descale, by What the Light Does (Works About 10% of the Time)

The CLEAN/DESCALE light has two meanings. Flashing means the back-flush cleaning cycle, which the book says is "separate from descaling". Solid means descale. Scale is a listed cause of no water, drips, no steam and cool coffee.

Flashing, so run the cleaning cycle:

1. Fit the 1 CUP basket, the cleaning disc and 1 cleaning tablet. Lock in the portafilter, with a container underneath.
2. Fill the tank and empty the drip tray.
3. Switch off with POWER. Press 1 CUP + 2 CUP, then also POWER, and hold all three for about 10 seconds.
4. It runs about 5 minutes and beeps twice. Repeat if the tablet hasn't dissolved.

Solid, so descale:

1. Dissolve one Breville descaling sachet in 34 fl oz (1 L) of water in the tank.
2. Hold 2 CUP, then also POWER. Wait until POWER, 1 CUP, CLEAN/DESCALE and HOT WATER/STEAM are all solid.
3. Press 1 CUP (coffee, about 25 s), turn the dial right (steam), then left (hot water). Repeat until the tank is empty.
4. Rinse the tank, refill to 2 L, run the three circuits again, then press POWER to exit.

Time: 5 minutes (cleaning); 20-30 minutes (descale)
Cost: Tablets and descaling powder (both in the box)
Success Rate: About 10%
Difficulty: Easy

If the light won't clear afterward, see our Breville descale light guide.

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Fix 7: Let the Thermal Cut-Out Cool (Works About 5% of the Time)

"Machine is on but ceases to operate" has one cause in the book: "the safety thermal cut-out may have activated due to the pump or grinder overheating."

1. Press POWER to switch off, and unplug it.
2. Let it cool for about 30-60 minutes.
3. Plug in and switch on.
4. If it keeps happening, call Breville Consumer Support.

Time: 30-60 minutes
Cost: Free
Success Rate: About 5%
Difficulty: Easy

Not a fault: after 5 minutes of continuous steaming, the machine disables steam and flashes the STEAM/HOT WATER light. Turn the dial back to STANDBY.

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When DIY Won't Work

Call Breville if:

• The thermal cut-out trips again after cooling
• There's no water from the empty group head with a full, locked tank after a descale
• Water leaks around the portafilter and won't stop. The book's fix is a new shower screen seal, ordered from Breville. See our Barista Express leaking guide.

Breville Consumer Support: 1-866-BREVILLE (1-866-273-8455) in the U.S., 1-855-683-3535 in Canada. Don't open the housing; the book's owner tasks stop at cleaning, the grinder, and the shower screen.

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Keep It Running

• Replace the water filter every 2 months, sooner in hard water.
• Keep the dial at STANDBY whenever you're not steaming or pouring hot water.
• Run the cleaning cycle when the light flashes, and descale when it's solid.
• Rinse the basket and portafilter after each use, and wipe the group head.
• Empty the drip tray at Empty Me! Auto purge sends water there after every shot.

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FAQ

How do I reset a Breville Barista Express?

The book has one reset. Press and hold PROGRAM until the machine beeps three times. That restores the default 1 CUP (about 1 oz / 30 ml) and 2 CUP (about 2 oz / 60 ml) volumes and the default water temperature. No other reset sequence appears in the BES870 book.

Why is my Barista Express POWER light flashing?

A fast flash means it's heating. It stops when the machine reaches temperature, and all the buttons light up. A slow flash means sleep mode, which starts after 1 hour without use. Press any button except POWER to wake it.

Can I make the Barista Express brew hotter?

Yes, with Advanced Temperature Mode. Switch off, hold PROGRAM, then press POWER. Within 5 seconds, press 1 CUP for +2 °F or 2 CUP for +4 °F. Pre-heating the cup and portafilter comes first in Breville's "coffee not hot enough" row, though.

Is the Barista Express Impress the same machine?

No. The Impress (BES876) is a different model with its own instruction book, so check that book rather than this page's steps. Its tamping system has its own guide: Barista Express Impress tamping. See our Barista Express Impress error codes guide.

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Related Breville Guides

• Barista Express Leaking Water?: auto purge, the tank and the shower screen seal
• Breville Grinder Not Working?: hopper lock, chute and burr cleaning
• Breville Not Heating?: pre-heating and Advanced Temperature Mode
• Breville Descale Light Won't Turn Off?: flashing vs solid, by model
• Barista Express Water Pump Problems: proving it's really the pump
• Barista Express vs Barista Pro: if you're weighing a replacement
• Barista Touch vs Barista Express: touch screen and automatic milk instead
• Barista Express vs Express Impress

Sources: Breville Barista Express BES870 Instruction Book (USCM V23).