If you are finding coffee grounds in the cup after brewing with a Breville Barista Express, the problem is usually around the basket, portafilter, grind, or spouts—not the boiler or heating system.
Most likely causes
| Symptom | Likely cause | What to check |
|---|---|---|
| Fine sediment in espresso | Very fine particles passing through basket holes | Grind quality and basket condition |
| Visible grounds around cup rim | Grounds spilled from portafilter/spouts | Basket rim, dosing mess, dirty spouts |
| Grounds after a messy extraction | Overfilled basket or poor puck prep | Dose and headspace |
| Sudden increase in sediment | Damaged basket or grinder producing excessive fines | Inspect basket and grinder |
1. Check the filter basket
Remove the basket and inspect it under good light. Look for bent metal, enlarged holes, cracks, or heavy blockage. A damaged basket should be replaced rather than scrubbed aggressively with sharp tools.
2. Avoid overfilling
If the puck sits too high, it can contact the shower screen and create a messy extraction. Use a dose appropriate to the basket and leave enough headspace for the puck to expand.
3. Check the grind
Espresso requires a fine grind, but an excessively fine or inconsistent grind can create a large amount of powdery fines. If your grinder is producing clumps or unusually dusty grounds, clean it and revisit the setting. See our Barista Express grind-size troubleshooting guide.
4. Keep the basket rim and spouts clean
Brush loose grounds from the portafilter rim before locking it in. Clean the underside and spouts of the portafilter regularly so old coffee particles are not washed into the next cup.
5. Test with the single-wall basket
If you normally use freshly ground coffee, the single-wall basket is the better diagnostic choice. If the problem only appears with one basket, that basket may be damaged or blocked.
Is Water Leakage a Common Issue in Breville Barista Express Machines?
Water leakage can be a recurring problem in some Breville Barista Express machines. Owners of the Breville Barista Express have reported instances of breville barista express water leakage. Proper maintenance and regular inspections can help address this issue, ensuring the machine functions efficiently and minimizes any potential water leakage.
When to suspect a machine fault
If grounds appear despite a clean, undamaged basket and portafilter, or the portafilter does not lock securely, inspect the group seal and portafilter fit. Persistent abnormal leakage or loose hardware is a reason to arrange service.
