How can i fix my Zanussi ZWF1440 washing machine?

I first noticed a problem when washing machine stopped dead and i left it for nearly a hour and the time on front changed from 23 mins to 17mins.
Since i have watched the machine it now gets through the whole wash programme but the sequence of actions begins with water entering prewash which is not selected and then main wash next. During the wash cycle there is a constant spray of water from the jet spray. The sequence of actions for my washing machine seems mixed but i can't be certain of this.
I would love to know what is wrong and what each of the sequences of the washes for this model of machine are so i can compare what it is doing to what it should be doing.