Hotpoint Aquarius wd440g washer dryer won't work!?

The problem is with my Hotpoint Aquarius WD440G washer/dryer. The door lock light will not come on. After selecting any wash, spin, or rinse cycle the corresponding light will come on but the door locked light stays off until after a couple of minutes and then it just flashes and nothing happens. If I select the drying programme the dry light won't come on either, it just flashes. I have looked on some internet forums and the only thing I've done is clean the filter which didn't seem that dirty. Anyone got any ideas?