Name the location
Use upper or lower cavity and identify oven, grill or combined selection. State whether the other cavity works from ordinary use already known.
Include the complete model
The model reference determines the layout and suitable components. A photograph of the whole control panel supports the symptom account; it does not replace assessment of the affected function.
A useful distinction
The smaller cavity may use different controls and functions from the main one. Keep references such as top grill and bottom fan cooking explicit so the assessment does not inherit an incorrect assumption about their construction.