Machine leaks coffee or water into the interior around the brew unit area.

Safety first: Unplug the machine and let it cool before removing the brew unit.

• Remove and inspect brew unit: Look for torn or flattened rubber seals around the piston and chamber.
• Clean and lubricate: Rinse the brew unit and apply a thin layer of food-safe silicone grease to the piston seal and sliding rails.
• Reinstall correctly: Ensure the brew unit is fully locked in place; misalignment can cause leaks.
• If leaks continue: The brew unit may need a seal kit or full replacement. Bosch sells complete brew units; replacement is usually straightforward for the user.