E13 error and the machine stops with water remaining in the reservoir; little or no water reaches the brew basket.

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

• Run multiple descaling cycles: Fill the reservoir with a 1:1 vinegar-water mix and run a brew cycle. Pause halfway to let the solution soak in the heater for 20–30 minutes, then resume. Repeat 2–3 times.
• Flush with clean water: Run at least two full tanks of fresh water to remove vinegar and loosened scale.
• Inspect reservoir outlet and check valve: Remove the reservoir and clean the outlet and any check valve with a brush. Ensure the valve moves freely.
• Check internal tubing (advanced): Remove the housing and inspect silicone hoses for kinks or white scale buildup. Replace any hardened or blocked hoses and the check valve if present.