Capresso digital coffee maker shows E3 and stops mid-brew or will not start brewing.

Safety first: Unplug the unit and allow it to cool. Never open the housing while the machine is connected to power.

Steps:

• Descale the machine: Fill the water tank with a Capresso-approved descaling solution or a mixture of white vinegar and water (per the user manual). Run a descaling cycle or several brew cycles without coffee to flush mineral buildup from the flow meter and tubing. Rinse with 2–3 full tanks of fresh water afterward.
• Check water tank outlet: Remove the tank and inspect the outlet valve and any mesh screen for debris. Rinse thoroughly and ensure the valve moves freely.
• Verify pump sound: During a brew attempt, listen for the pump. A loud humming with no water movement suggests a seized or air-locked pump. Try priming by filling the tank completely and starting a brew; sometimes air pockets clear after a few attempts.
• Inspect for kinks (if accessible): If you can safely remove the bottom cover (unplugged), check silicone hoses from the tank to the pump and from pump to heater for kinks or pinches.
• If E3 persists: The flow meter sensor or pump may be defective. Replacement of the flow meter assembly or pump is required and is typically a moderate to advanced repair.