Its condition and installation need to be established before cooking. Time in storage can leave damage, contamination or uncertainty about connections that a quick power-on does not resolve.
What the observation means
Check externally for obvious damage and retained packaging without opening electrical compartments. Do not assume a dry-looking appliance is ready after damp storage. The model's instructions and a competent installation assessment are the right references.
A useful next step
Keep its storage history available and arrange advice if anything is uncertain. Do not run a maximum-temperature cycle to 'dry it out' or prove it works. Appliance repair and fitting a newly installed oven should be discussed as separate scopes.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.