My dishwasher will start a selected programme, drain pump works fine, water inlet is evident then after several minutes the green start light flashes continuously. If I hold start button as manual suggests, the green light goes out,I press the start button again but the programme just \\\'toggles\\\' between pre-rinse and end, and therefore doesn\\\'t actually enter the wash cycle. All filters are sparkling,inlet not blocked, any ideas please?