Some top cavities combine oven and grill functions. Selecting only one control may leave the intended mode incomplete or choose a different heat source.
What the observation means
A grill setting can also use a scale that is not equivalent to an oven temperature. The correct control combination and door position come from the model's guide.
A useful next step
Record both selections when explaining a problem. If a mode remains ineffective after following the normal sequence, request assessment. Do not experiment with extreme combinations or assume the cavity should heat merely because one knob is away from Off.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.