Water leaks from the bottom of the coffee maker during or after brewing.

Safety first: Unplug the coffee maker immediately and keep it away from water on the counter. Do not operate a leaking appliance.

• Identify leak source: Dry the exterior, then add water to the reservoir and observe where it drips from the bottom (without plugging in). This helps distinguish reservoir leaks from heated water leaks.
• Inspect reservoir: Remove and fill the reservoir over a sink to check for cracks or leaks at seams and outlet valves.
• Internal inspection (advanced): Remove the base and look for wet areas around hoses, clamps, and the heater. Tighten any loose clamps and replace cracked hoses or O-rings.
• Dry thoroughly: After repairs, allow the interior to dry completely before reassembly to avoid electrical shorts.

If the heater body itself is cracked or corroded and leaking, the heater assembly must be replaced; this is typically a professional repair.