Domestic Appliance Forum

Hi , We have a De Dietrich dishwasher model DVH740JA1 , it has stop working and is showing a blue light with error do7. Being a plumber myself and being the person who install the unit in our house , I checked for water leaks and it as sound as. . I cannot see why it has stopped working and there is no way to reset this fault button to get it started again . Can you advise . Thanks.