If there is the SE or 5E error code on the display, the dishwasher is experiencing a draining issue: there is something that prevents water from getting out of the tub. This could be caused by a clog in the drain hose. Check it around the garbage disposal port. If it is all right, you will need to inspect the drain pump. Not unlikely, it is jammed by a foreign object or piece of debris. If there is not any, you should check the ECS sensor. Probably, it needs to be replaced. Finally, you can check the hose at the garbage disposal unit. If you have checked everything you could, and the error is still there, call a professional technician.
Other Samsung dishwasher error code: