Record both modes and the point of change. The oven may alter its heat distribution immediately, while the cavity and cookware retain heat from the first stage.
What the observation means
A dish that began under conventional heat can behave differently after a grill, fan or base-heat selection, even at an apparently similar temperature. The transition is not equivalent to starting a fresh recipe in a cold oven. Residual heat and the food's already cooked surface influence what happens next. That makes the sequence more useful than a single final setting.
A useful next step
Follow a recipe or manufacturer method that explicitly uses staged cooking, and check any required door or shelf changes before starting. If the oven reacts unexpectedly to a mode change, stop the programme where appropriate and preserve the displayed selections. Do not keep cycling through functions to discover one that masks a suspected fault or repeatedly exposes the food to uncontrolled heat.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.