Display shows E10 and the unit will not brew; often associated with descaling or cleaning cycles.

Safety first: Unplug the unit and allow it to cool before descaling.

• Run a full descale cycle: Fill the reservoir with a 1:1 mixture of white vinegar and water (or manufacturer-approved descaler). Start the descale program if your Gourmia model has one, and allow it to complete fully without interruption.
• Manual descale if no program: Brew until half the reservoir is empty, then pause for 20–30 minutes to let the solution soak. Resume brewing until empty. Repeat once if heavy scale is suspected.
• Rinse thoroughly: Run 2–3 full reservoirs of fresh water through the system to flush out descaler.
• Reset descale indicator: Follow the user manual steps (often holding a specific button combination) to clear the descale warning. If E10 remains, the scale sensor or control logic may be faulty.