Dishwasher will not finish cycle.

This could be one of a few things,first it sounds like it may be getting stuck on the rinse cycle,check if the water in the machine is hot if not there is either an element problem or the timer is not functioning properly,if the water is hot then it may not be draining before taking on rinse water the best way to determin if it is indeed draining and refilling is to switch the machine off ,take the drain hose and put it on the floor or in a bucket,if it drains let it finnish and then put back and switch the machine on it should fill and continue.if it does not drain then you have a blocked pipe or fualty pump,Do not reset the machine