Safety first: Allow the basket to cool before handling; hot coffee can cause burns.

Use correct filter: Ensure you are using the correct size and type of filter recommended by Panasonic.
Clean outlet: Remove the basket and clean the outlet hole and drip-stop mechanism thoroughly.
Reduce grind fineness: Very fine grinds can block the filter; use a medium grind for drip coffee.
Test with water only: Run a cycle with just water and an empty basket to confirm that drainage is normal.

Water remains in the filter basket after brewing; coffee bed is flooded.

Possible Causes