How to Fix Common Coffee Machine Brewing Issues

If your espresso machine flashes a cryptic English error or suddenly stops brewing, you’re not alone. Many high-end automatic coffee machines display troubleshooting messages in English, leaving many users confused about what’s wrong or how to fix it. Whether it’s a blocked brew group, missing coffee beans, or a full drip tray, knowing what these messages mean and how to respond can save your shot—and your machine.

To fix most common coffee machine issues, start by identifying the error code: for a blocked brew unit (BREW UNIT BLOCK), clean and reinsert it. For empty beans (COF. BEANS EMPTY), simply refill the hopper. Always address water system errors—like a lack of water (FILL WATERTANK) or descaling needs (DESCALE READY FOR USE)—promptly to prevent damage.

Common Coffee Machine Error Codes & Quick Fixes

High-end espresso machines often display error messages in English. Here’s what they mean and how to respond:

• BREW UNIT BLOCK: The brew group is blocked or jammed. Remove, clean, and reinsert it properly.
• BREW UNIT MISS: The brew group isn’t seated correctly or the service door is open. Check and secure it.
• COF. BEANS EMPTY / FELL COFFEE BEANS: No coffee beans in the hopper. Refill and restart the machine.
• DESCALE READY FOR USE / DREGDRAWER FULL: The drip tray or coffee grounds container is full. Empty and clean it.
• DREGDRAW MISS: The coffee grounds drawer isn’t closed properly. Push it in until it clicks.
• ENERGY SAVING: The machine is in standby. Press ENTER to wake it up.
• GRINDER BLOCKED: The grinder is jammed. Clean it or call for service.
• OVER TEMPERATURE: Let the machine cool and drain excess water.
• VENTILATE: Drain the boiler or water lines before they heat up if they’re empty.
• WARMING UP: Wait 3–5 minutes until “SELECT PRODUCT” or “READY FOR USE” appears.

How to Clean a Blocked Coffee Machine Filter

A clogged filter affects water flow and extraction. To clean it:

1. Use a spoon handle to gently pry the filter out from its recesses on both sides (avoid sharp tools).
2. Place the filter, seal ring, and portafilter in the drip tray. Add 30g of coffee machine cleaning powder and 900ml of hot water. Soak for 20 minutes, then rinse thoroughly.
3. Soak everything again in hot water overnight. Reinstall the filter the next day with the printed side up. Slide the seal ring flat onto the filter, place inside the portafilter, and press straight down—do not tilt. Twist counterclockwise to secure.

Note on Installation: Ensure the seal ring is positioned with the printed side facing up before placing it on the filter, then into the portafilter. Install the portafilter straight and flush—no tilting.

Coffee Machine Troubleshooting: Step-by-Step for Common Problems

These are fixes for mechanical and operational issues beyond error codes:

• Machine won’t turn on: Check if the machine power switch and wall outlet are on. Verify wiring.
• Boiler lacks water: Confirm external water supply is connected, the auto-fill is on, and the filter isn’t clogged. Check the pump, fuse, and water inlet valve.
• Too much water in boiler: Clean or replace a dirty inlet solenoid valve. Inspect the heat exchanger for damage and check electrical connections to the water level sensor.
• No steam from nozzle: Check boiler water level, pressure switch, heating safety device, and clean any clogged nozzles.
• Cannot extract espresso: Ensure there is water, the brew group solenoid and pump work, fuses are intact, and nozzles aren’t blocked.
• Leaking machine: Clear blocked drains and replace cracked or loose hoses.
• Espresso too cold: Replace faulty heating elements, check wiring, descale the heat exchanger, and ensure the safety controls and circulation path work.
• Espresso too hot: Adjust the pressure switch and use a proper grind size.
• Coffee flows too fast: Grind finer, check machine temperature.
• Coffee flows too slow: Grind coarser, clean the portafilter, check brew group solenoid, internal pathways, and nozzles.
• Coffee puck too wet: Check solenoid closure, wait for proper temperature, adjust grind, and inspect water circulation.
• Pressure gauge inaccurate: Replace the gauge if it reads incorrectly.
• All panel lights flash: Ensure water is added within 2 minutes, pipes are connected, filters are clean, and electrical grounding is solid.
• Poor extraction: Check the grinder’s dosing mechanism, flow meter wiring, dry any wet electronics, and replace faulty flow meters.
• Only manual buttons work: Replace blown computer fuses and check wiring.
• Pump runs only manually: Replace pump fuses.
• Pump leaks: Replace damaged seals or repair loose inlet/outlet parts.

Frequently Asked Questions

What does “BREW UNIT BLOCK” mean on my coffee machine?

“BREW UNIT BLOCK” means the brew group is jammed or obstructed. Remove the brew group, clean it thoroughly, and reinsert it properly to restore normal function.

How do I fix a clogged coffee filter in my machine?

To unclog the filter, gently pry it out with a spoon handle, then soak it along with the seal ring and portafilter in a solution of 30g coffee machine cleaner and 900ml hot water for 20 minutes. Rinse and soak overnight before reinstalling with the printed side of the seal ring facing up.

Why is my espresso machine displaying “DESCALE READY FOR USE”?

This message means the drip tray or coffee grounds container is full. Empty the drip tray or grinder waste box completely to resolve the issue.

What should I do if my coffee machine won’t extract coffee?

Check for water supply issues, test the brew group solenoid and pump, inspect fuses, and ensure nozzles are not blocked. Also verify the grinder is functioning and the portafilter is correctly installed.

How do I handle a blocked grinder in my coffee machine?

If your machine shows “GRINDER BLOCKED,” turn off the machine, remove any bean blockages, and clean the burrs and grinding chamber. If the issue persists, contact technical support.

Recommended FrontStreet Beans for Espresso Machines

For reliable espresso brewing, try FrontStreet Coffee’s Ethiopia Huakui – a bright, juicy Ethiopian single origin with notes of blueberry and citrus, ideal for testing grind and extraction. Pair it with the Classic Blend for a balanced, chocolatey foundation, or the Black Cocoa Blend for a rich, dessert-like shot. All three beans are freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.