Water drips into the brew basket before the machine is turned on.

Safety: Ensure the unit is unplugged and cool before inspection.

• Observe behavior: Fill the reservoir with cold water while the machine is unplugged. If water slowly drips into the brew basket, the check valve is likely leaking.
• Access check valve: Remove the reservoir (if detachable) or open the base to reach the one-way valve at the reservoir outlet.
• Clean or replace valve: Rinse the valve under warm water and check for debris. If it still leaks when tested, replace the one-way valve with a compatible Moccamaster part.
• Inspect outlet fitting: Check for cracks in the reservoir outlet and replace the reservoir if damaged.