Follow the model's instruction for that message. A maintenance prompt, an interrupted cleaning sequence and a blocking fault are different states.
What the observation means
Descaling uses a specified product and sequence; it is not an ordinary cooking programme. Food and accessories may need to be removed, and rinsing stages can be essential. Do not treat a partly completed maintenance process as ready for food preparation.
A useful next step
Finish or recover the sequence only through the documented owner procedure. Record the exact message and the last completed stage if it stops. Never add a general kettle descaler or combine cleaners without explicit approval for the oven.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.