Its installation, complete model and known history matter more than the seller's description alone. A claimed working test does not establish the condition of every function.
What the observation means
Keep any paperwork about previous repairs or alterations. An oven fitted into a new cabinet also needs the correct installation arrangement; a symptom after fitting may not be solely an appliance issue.
A useful next step
Use the manufacturer's owner instructions and arrange suitable assessment if the condition is uncertain. Do not perform a sequence of high-temperature tests to establish a missing history. Report obvious damage or modified connections before further use, and keep appliance repair separate from new installation work.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.