The water reservoir could be clogged. Where are you located, If you are in the lime/rust belt and haven't descaled your brewer you may be in for a shock. Brewers in the "lime belt" need constant attention. If there is a clog or impediment in the inlet or outlet you may not readily get the delimer through it. You also need to check the outlet to the filter holder and see if there is a clog....Also be sure the heater is functioning so the water will "perk" and expand through the delivery tubing to the filter holder assembly.