Handling a Blocked Carafe on a Breville BES850

Recognizing a Blocked Carafe

When the Breville BES850 pauses unexpectedly, a faint hiss of steam, or the display flashes a warning, the most common culprit is a blocked carafe. Unlike a simple clog in the brew head, a blockage inside the carafe can stem from mineral deposits, coffee oils, or even foreign objects that have inadvertently fallen in during cleaning or refilling. Identifying the issue quickly prevents damage to the machine and ensures every cup of coffee is brewed to perfection.

The Anatomy of the Carafe

The carafe is a sealed glass reservoir that holds the brewed coffee. Inside, there is a small, removable drip tray, a drip channel that directs liquid into the reservoir, and a gasket that seals the lid. If any part of this system becomes obstructed, water may not flow correctly, leading to pressure build‑up or an uneven pour. Familiarizing yourself with these components will make troubleshooting easier.

Key Components

• Drip Tray – Holds the brewed coffee before it enters the reservoir.
• Drip Channel – The path through which coffee moves from the tray to the reservoir.
• Gasket – A silicone seal that keeps the lid and reservoir airtight.
• Carafe Lid – Protects the reservoir from contamination and keeps pressure balanced.

Step‑by‑Step Guide to Unblocking the Carafe

1. Power Off and Unplug

Safety first. Ensure the machine is switched off and unplugged from the wall outlet. Let it sit for at least ten minutes to allow any residual pressure to dissipate.

2. Remove the Carafe

Gently lift the carafe from the machine. If it feels stuck, wiggle it slightly; do not force it. This prevents damage to the gasket or the carafe itself.

3. Inspect the Drip Tray

• Remove the tray from the reservoir.
• Look for coffee grounds, oils, or any foreign objects.
• If you find debris, clean it with a soft cloth or a non‑abrasive sponge. Avoid using harsh chemicals that could leave residues.

4. Examine the Drip Channel

• Inspect the channel for mineral buildup or oil stains.
• If mineral deposits are present, rinse the channel with a mild vinegar solution (1:1 vinegar to water). Let it sit for 15 minutes, then rinse thoroughly.
• Use a small brush or a toothpick to gently dislodge stubborn deposits.

5. Check the Gasket

• Lift the gasket from the carafe lid.
• Look for cracks, warping, or dried coffee oils.
• If the gasket appears worn, replace it with a new one. Breville sells OEM gaskets that fit the BES850 model.

6. Clean the Carafe Lid

• Remove the lid carefully.
• Wash it in warm soapy water, ensuring that all crevices are cleaned.
• Rinse well and dry with a lint‑free cloth.

7. Reassemble

• Place the gasket back on the lid, making sure it sits evenly.
• Put the lid back onto the reservoir, aligning it with the drip channel.
• Slide the drip tray back into place.

8. Run a Test Cycle

• Reattach the carafe to the machine.
• Insert a small amount of water into the reservoir to simulate a brew cycle.
• Turn the machine on and observe if the water flows smoothly through the drip tray and into the reservoir.
• If the system operates normally, the blockage is cleared.

9. If the Problem Persists

• Double‑check each component for overlooked debris.
• Consider the possibility of a deeper clog in the machine’s internal plumbing.
• If the blockage remains, it may be time to contact Breville customer support or a qualified technician.

Preventive Maintenance Tips

Regular maintenance reduces the likelihood of future blockages and keeps the BES850 running efficiently.

• Use Filtered Water – Mineral‑rich tap water accelerates deposit buildup. A built‑in water filter or external filtration system can mitigate this.
• Clean After Each Use – Run a cleaning cycle after every brew. Breville’s cleaning kit includes descaling tablets and cleaning pods.
• Descale Every Three Months – Follow the manufacturer’s descaling instructions to remove mineral deposits from the internal system.
• Avoid Overfilling – Do not exceed the maximum water level marked inside the reservoir. Overfilling can force water into unintended pathways.
• Store Cleanly – When not in use, keep the carafe and drip tray clean and dry.

Common Misconceptions

Misconception 1: The Carafe Is Impossible to Clean

Many users think the carafe’s internal channels are too small for thorough cleaning. While the channels are narrow, they are accessible. Using a mild vinegar solution and a small brush will effectively remove most deposits.

Misconception 2: Only Coffee Oils Cause Blockages

Coffee oils are a major contributor, but mineral deposits from hard water are equally problematic. A combination of both can create stubborn clogs that require more intensive cleaning.

Misconception 3: Disassembling the Machine Is Necessary

You only need to remove the carafe and its immediate components. The internal brew head and water lines do not require disassembly for a typical carafe blockage.

Troubleshooting Quick‑Fix Checklist

• No Flow – Check drip tray and channel for obstructions.
• Uneven Pour – Inspect gasket for seal integrity.
• Excessive Steam or Warning Lights – Run a descaling cycle.
• Machine Doesn’t Start – Ensure the carafe is properly seated.

If none of these solutions work, the problem may lie deeper in the machine’s plumbing, warranting professional service.

When to Call for Professional Help

• Persistent blockage despite thorough cleaning.
• Visible damage to internal components.
• Persistent error messages on the display.
• After a recommended service interval (typically 12 months of regular use).

Contact Breville’s support line or a certified technician. They can inspect the internal plumbing, check electrical components, and provide repairs that are beyond DIY capabilities.

Final Thoughts

A blocked carafe on the Breville BES850 can seem daunting, but with a methodical approach it is a manageable issue. By understanding the structure of the carafe, performing targeted cleaning, and following preventive maintenance practices, you can keep your coffee maker operating at peak performance. Remember that regular cleaning and descaling are your best defense against future blockages, and never hesitate to seek professional assistance if the problem persists.

Enjoy every cup—now that your carafe flows freely, your mornings are back on track.