Diplomat Dish Washer Issues again?

I have a dish washer, it starts a cycle but only for about 5minutes then stops with persistant beeping and a flash last green/yellow light on the right. Have read the blogs and not sure what people mean by the programme button have tried the four presses on numerous button, I also can find the black box people are referring to to see if it is flooded any help greatly appreciated. Many thanks James.