When my dishwasher is filling the start light seems to come on and off and the dishwasher fills slowly. When the light comes on i can hear the pump but then it goes off for a second and then comes back on. This happens until the dishwasher is full enough to start the cycle. To me it sounds like a blockage on the inlet but is there a filter in the inlet side? or could it be something else causing it? Thanks for any help in advance.