weve got a whirlpool adg722 and the start button was just flashing when we tried to use dishwasher.we cleaned out filter and it was still the same so i took out waste pipe cleaned the end and tried to blow down it to see if it was blocked and sure enough it was.so i poured down the filter a bottle of domestos pipe and sink unblocker left it about ten mins refitted waste pipe and tried washer again by holding start button for about ten seconds and hey presto it was fixed so if anyone has same problem give that a try first before you call out the expensive dish washer repair man anyone know where i can download the manual from as the washer was here when we moved in thanks