I rent a property with a Chef Auto 600 oven with a vitro-ceramic cook top. Due to bushfires recently, the eclectricity was lost a number of times. I came home to find the buzzer on my oven buzzing and a display of H9 9H. The oven won't work and I can only stop by turning the dial to left. I would like to know if this is an auto setting problem or if the oven has been damaged.