Clogging and backing up of water and/or coffee in the filter basket can occur under any or a combination of any of the following conditions: The use of too finely ground cof- fee, using two or more paper filters, using the gold tone filter in conjunction with a paper filter or not properly cleaning coffee grounds from the gold tone filter, or allowing coffee grounds to spill over the filter. Caution: Never open the filter basket during the brewing cycle, even if no water is drain- ing from the filter basket, since extremely hot water/coffee can spill out from the.