Our Simpson 2001 Wall Oven is flashing 00:00 and Auto. The power was turned off today and whenwe went to cook dinner we noticed it was flashing. It's happened before but pressing buttons has worked in the past. I have tried holding a combination of any two buttons down while trying to set the time. We have turned mains power off and on again. We have tried pressing a combination of buttons but the numbers won't change from 00:00