There are many reasons why the washing machine does not work, this question is to vague to be of use to an engineer trying to pre diagnose a problem.

Understanding the sequence of events allows more accurate fault reporting, for example, many washing machines will step through the programme as follows:

1) power up the on/off button

2) select the correct programme

3) press start button

4) the door interlock activates and locks the door

5) the washing machine starts to fill with water

From the above its possible to be more specific with the reported fault and increase the engineers ability to fix the washing machine on the 1st visit.