When using a paper filter, there might be times that the filter will collapse and may cause an overflow. If the filter is collapsing in your coffee brewer, first make sure you are using the correct size and shape filter in the unit.

Basket Filters: (Paper or Permanent)
4 cup filter - 4 cup coffeemaker
8-12 cup filter - 8, 10, or 12 cup coffeemaker

Cone Filters: (Paper or Permanent)
# 2 cone filter - 4 cup coffeemaker
# 4 cone filter - 8, 10, or 12 cup coffeemaker


If you are using the correct size, try the following:
  1. Wet the sides of the filter before adding the coffee and sticking them to the sides of the filter basket.
  2. A permanent filter would also solve this problem.