Nuova Simonelli Aurelia II Message FINE GRINDING: Shots Running Slow
FINE GRINDING on a Nuova Simonelli Aurelia II (Digit, V and S) is a coffee setting message, not a machine breakdown. It shows when the delivery time is much longer than the set values, so the grind is too fine and water struggles to get through the coffee. Change the grinding degree to a coarser setting and press the key to clear the message.
Low: an operator prompt about the grind; the machine keeps running.
- Code
- FINE GRINDING
- Maker
- Nuova Simonelli
- Equipment
- Espresso machines
- Applies to
- Aurelia II Digit / V / S
What does Nuova Simonelli FINE GRINDING mean?
The Aurelia II times each shot against the values set for that key. A delivery that takes much longer than those values tells the control that the coffee bed is putting up too much resistance, and the display shows FINE GRINDING. A grind that is too fine packs into a dense puck, so water has to push hard to get through, and the shot comes out slow, bitter and sometimes burnt. The machine itself is working as designed, and the answer is at the grinder. The handbook points at the grind setting, the dose size and tamp pressure, the age and freshness of the coffee, and a partly blocked group screen. Fresh beans release gas that slows the shot, while stale coffee behaves the other way, so a new bag can bring the message back even when the grinder did not move. A screen that has built up oils restricts the flow no matter how the coffee is ground, which is why a cleaning routine matters. Treat FINE GRINDING as a cue to adjust, taste and clean, not as a service call.
Affected models and control systems
This applies to Nuova Simonelli Aurelia II machines in the Digit, V and S versions (User Handbook, March 2012).
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- FINE GRINDING shown after a shot
- Shots taking much longer than the set time
- Bitter or burnt taste
- Coffee dripping slowly from the portafilter
Possible causes
Listed in Nuova Simonelli's documentation
- Grind set too fine for the dose
- Dose too large or tamp pressure too heavy
- Very fresh or oily coffee slowing the flow
- Group screen partly blocked
Other likely causes — what usually sits behind FINE GRINDING on this control. A technician confirms which one it is before any part is replaced.
- Grinder setting creeping finer after a deep clean or refill
- New bag of fresh beans that releases more gas
- Group screen oils building up between backflush cleanings
Safe checks before calling for service
- Change the grinding degree to a coarser setting, as the owner's manual directs.
- Press the key to clear the message.
- Pull another shot and check the timing.
- If shots stay slow with a coarser grind, call us and tell us the setting, dose and when the group screen was last cleaned.
How a technician diagnoses FINE GRINDING
- Read the message and the set time for that key.
- Check the grind, dose and tamp with a scale and timer.
- Remove and inspect the group screen and shower.
- Check pump pressure at the group with a gauge.
- Adjust or repair only after these checks.
- Pump pressure adjustment is done inside the machine near hot parts and live wiring.
- Group screen and shower removal needs the right tools while the group is hot.
- Pressure readings at the group need a test gauge.
How FINE GRINDING differs from similar codes
COARSE GRINDING is the opposite message, for shots that run too fast.
Technical reference
- Document
- Aurelia II (S, V, Digit) User Handbook March 2012, Function Messages p.75-78
- Edition
- March 2012 (Marzo 2012); no part number printed
- Models / control
- Aurelia II Digit / V / S
- Section
- 10. Aurelia Digit Machine Function Messages, p. 75-76 (messages listed as DIAGNOSIS OF ERROR, DELIVERY ERROR, DOSER ERROR, LEVEL ERROR, PRESSURE ERROR, OVERCURRENT ERR., FINE GRINDING, COARSE GRINDING); 11. Aurelia V, p. 77; 12. Aurelia S, p. 78
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Nuova Simonelli espresso machine error codes
Is FINE GRINDING a machine problem?
No. It is a coffee message, and a coarser grind usually fixes it.
Why did it start with a new bag?
Fresh beans slow the shot, so the grinder may need a small change.
When should I call?
If shots stay slow with a coarser grind and a clean screen, the pump or group needs a look.
Need help with Nuova Simonelli FINE GRINDING?
A technician confirms the cause on site and gives you the price in writing before any work starts.