I have a smeg dwf 64.1 ss dishwasher which gets stuck half way through the wash program and just goes on and on washing in steaming hot water forever. I switched it on one evening and it was still washing the next morning. I suspect the main program control dial needs changing but could it be something else. This machine does not have any fancy led’s or other fault detecting devices. Can anybody help? I rang Smeg for advice but they politely said that they do not provide any technical advice, although they are very happy to sell me spare parts.