washing machine ?

hi i have a hotpoint aqurius wmf540g ive had problems since i got it but i thought that was the ammount of different programes i was using . half way threw a cycle it the door light would flash and so i would have to turn it off then on again at the mains and it would continue its programme now it will not even start it continues to click and the door light flashes when i try to start a programe it makes a clicking noise we have just replaced the door interlock and it looked as if it was working but then started to flash again and now back to not even starting a programme and flashing and clicking to say the door hasn`t been shut ( which it has ) as soon as the start button is pressed its not even two years old . i will be very gratefull if you could let me how to fix this i have three young children and a mountain of washing x