When a dishwasher stops draining water at the end of its wash cycle, start by ensuring there are no obstructions in the drain path that prevent the waters exit. If no blockage is apparent, then a more in-depth investigation is needed to identify the issue.
Factors that can prevent water from being pumped from your dishwasher include damaged check valves, electronic control board or timer failure - or it could be your washer drain pump.
The best approach for any failure of these components is replacement. Norris Spares recommends that you engage the services of a professional dishwasher technician to identify and repair issues with your washer.