8 Common Reasons Your Moka Pot Don't Brew Constantly. 1. Wrong Coffee Grind Size. Use too fine grinds may logged central pipe and weight while too coarse grinds may clogged the filter. 2. Wrong Water & Coffee Measures. Please put exact 16g coffee grinds and fill cool water on the boiler just below the water line. 3. Tamp or overfill. Tamping and overfilling increases the pressure it required for the brew to travel upward. 4. Remove Grounds on the Edge of the Collector. Remove all the loose grounds on the top edge of the funnel and in the grooves of the screw parts of the boiler. 5. Tighten Your Moka Pot Securely. 6. Replace the filter & Gasket every 6 months. A worn filter or gasket won't allow the pressure to force the water through the grounds. 7. Remove all coffee grounds from the heating plate and keep it clean during each use. Coffee grounds on the heating plate or the bottom of the moka pot would lead to poor heating creating not enough pressure to force the water through the grounds. 8. Clogged Central Pipe or Weight Regularly. A clogged filter and center pipe will block the coffee from flowing to the collector so your moka pot will stop producing coffee. Quick & Easy Homebrew. The small single-serve espresso machine will brew coffee and froth milk simultaneously with the one-click operation. Simply select a desired mode on the touchscreen and enjoy a barista-quality cappuccino, latte and macchiato within just 3 minutes at home. Quick & Easy Homebrew. The small single-serve espresso machine will brew coffee and froth milk simultaneously with the one-click operation. Simply select a desired mode on the touchscreen and enjoy a barista-quality cappuccino, latte and macchiato within just 3 minutes at home.