While you wait for answers, we may have found some information which could help you.
Click here for Bottom Seal DishwasherSmeg Integrated dishwasher?
Smeg dishwasher DI612CA?
How to install new knob for smeg dishwasher Type 10028; mod:?
Smeg Dishwasher Intergrated 14yrs old?
Following prev question smeg DF614WE powercut?
It seems the program is frozen?