The causes of the fire in the black gold steel oven are improper operation of the oven, excessive grease in the ingredients, incomplete cleaning of the oven and circuit problems.

1. Improper operation of the oven: If it is not properly operated, it may lead to overheating and uneven temperature of the oven, thus causing the barbecue to catch fire.

2. There is too much grease in the food: if there is too much grease in the food, it is easy to cause a fire.

3. The oven is not thoroughly cleaned: it needs to be cleaned before use. If it is not thoroughly cleaned, some substances such as oil stains may remain, which may lead to a fire.

4. Circuit problem: If there is a problem with the circuit of the oven, it may also lead to a fire.