How can I fix my diplomat 8352 dishwasher?

I have had this dishwasher for 3 years but hav'nt used it regularly in the last few months, now when I switch it on it sounds like it is pumping water out and then it fills with fresh water then it just makes a buzzing sound. Sometimes it will start the wash programme but mostly it does'nt. I have been told that it sounds as though the motor has siezed up? Is there a fix for this problem?