Nuova Simonelli Aurelia II Message DELIVERY ERROR: No Doser Signal
DELIVERY ERROR on a Nuova Simonelli Aurelia II (Digit, V and S) means a delivery ran to the 120 second time limit without the doser sending the control any commands. The shot was not under control. Stop the delivery, press the flashing key to clear the message and check that the portafilter is not packed too tightly.
Medium: the shot is not controlled by volume, and that group may be unusable until the doser or flow problem is fixed.
- Code
- DELIVERY ERROR
- Maker
- Nuova Simonelli
- Equipment
- Espresso machines
- Applies to
- Aurelia II Digit / V / S
What does Nuova Simonelli DELIVERY ERROR mean?
During a delivery, the doser counts the water that passes through the group and sends pulses to the control, which uses them to stop the shot at the programmed volume. The control also keeps a time limit of 120 seconds as a backstop. If the delivery runs to that limit and the doser has sent no commands at all, the display shows DELIVERY ERROR, and the display indicator and a key flash continuously. The group has been running water with no measurement, so the shot is not under control and the delivery stops at the limit. The control cannot say whether the doser has failed or whether water is simply not flowing. A very tight portafilter or a blocked group screen can hold the water back, so there are no pulses. The causes listed are the doser signal, the wiring from the doser to the control, a blocked flow in the group, and the pump and group solenoid valve. DELIVERY ERROR is the longer version of DOSER ERROR, which reports the same lack of pulses after only 3 seconds.
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
- Water running at the group for a long time
- The display indicator and a key flashing
- DELIVERY ERROR on the display
- A shot stopped at the time limit
Possible causes
Listed in Nuova Simonelli's documentation
- Doser (flowmeter) signal missing
- Wiring from the doser to the control damaged
- Flow blocked in the group, such as a packed screen
- Pump or group solenoid valve not working
Other likely causes — what usually sits behind DELIVERY ERROR on this control. A technician confirms which one it is before any part is replaced.
- Scale in the doser turbine so it no longer spins
- Group screen clogged with fine coffee oils
- Doser connector loosened by machine vibration
Safe checks before calling for service
- Stop the delivery if it is still running.
- Press the flashing key to clear the message, as the owner's manual directs.
- Check the portafilter and the group screen for coffee packed too tightly or blocked.
- If it shows again after that, call us and tell us which group and key, and what the water did.
How a technician diagnoses DELIVERY ERROR
- Read the message and note which group and key.
- Run water through the group without the portafilter to check flow.
- Inspect the group screen and shower for blockage.
- Check the doser signal and the wiring to the control.
- Test the group solenoid valve and pump pressure.
- Replace the doser or valve only after the test.
- The doser and solenoid sit inside the machine with live wiring and hot water.
- Telling a blocked flow from a failed doser needs a flow test at the group.
- The pump runs at high pressure that can cause burns if lines are opened.
How DELIVERY ERROR differs from similar codes
DOSER ERROR reports no doser pulses within the first 3 seconds. DELIVERY ERROR waits until the full 120 second limit.
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 DELIVERY ERROR different from DOSER ERROR?
They are close. DOSER ERROR comes after 3 seconds without pulses, while this message comes at the 120 second limit.
Can I pull another shot?
Yes, after clearing the message and checking the portafilter. A repeat points to the doser or the group.
Is it dangerous?
Only that hot water can run freely, so stop the delivery quickly.
Need help with Nuova Simonelli DELIVERY ERROR?
A technician confirms the cause on site and gives you the price in writing before any work starts.