Machine shows E13 and disables automatic dosing; volumetric shots may not stop correctly.

Safety: No internal high‑voltage work is required for basic checks, but unplug the machine if removing covers.

• Reset dosing: Enter the programming menu and reset volumetric doses to factory defaults (refer to the Rancilio manual for your model).
• Prime the system: Run several manual brew cycles to remove air from the hydraulic circuit. Air bubbles can cause erratic flowmeter readings.
• Recalibrate doses: Program each dose by timing and volume, following the manufacturer procedure. Save settings and test.
• Check flowmeter: If E13 persists, inspect and clean the flowmeter as described for E04. Replace if necessary.
• Control board: Persistent calibration errors after hardware checks may indicate a memory fault on the control board; replacement may be required.