How can i fix my Indesit WIL133?

Hi there, i have inherited this waching machine from a Grandmother, it was working fine a couple of days ago and now after the rinse it then doesn't drain the water away even though it sounds like it should be, after about 5 to 10 mins of this it then flashes the door lock light, the stain removal light and the extra rinse light all at the same time, you can't turn it off or open the door. HELP!!!!