E15 error; machine reports a descaling or maintenance fault and refuses to brew even after descaling.

Safety: Follow only manufacturer-approved procedures when accessing service menus.

• Repeat descaling: Run the full descaling program again from start to finish without interruption. Use the correct amount of Zwilling-approved descaler.
• Follow prompts exactly: Ensure you confirm each step on the display and do not remove the tank or unplug the machine mid-cycle.
• Check descaling sensor: Some models use a conductivity or flow-based sensor to verify descaling. If accessible, inspect the sensor and wiring for damage.
• Reset maintenance counter: If the error persists, consult the service documentation or contact Zwilling support for instructions on resetting the descaling counter via a service menu. This may require a technician.