How do i fix the problem im having with my washing machine?

Zanussi jetsystem 1200 FJS1225W ... When doing a load of washing, it says on the digital led screen 52(mins) but it will take over 3 hours to do a load of washing and throughout the cycle i have to constantly get up to press the green start button about 10 times because the washing machine stops its self an starts to make a continuous bleeping noise until i re-press the start button, it comes up as a error but if i press the green start button it continues the cycle again, until 3 hours later when its finally finished ... please help me fix this problem its driving me insane :)