How can I fix my Hoover Nextra 1600 HNL662 washing machine?

When trying to start a wash sometimes instead of starting properly the 15 minute light comes on and the machine starts to try to drain for a few minutes even though the drum is dry and then turns off . I have cleaned the filter and that has not helped. To stop it doing this I sometimes have to turn the power off to the machine and then try again. Please could someone tell me what is wrong and how to fix it, it is driving me nuts!