Review the model's instructions for returning an unused appliance to service. Storage conditions, water connections and any prior fault matter more than the length of time alone.
Understanding this situation
An empty drum does not establish that hoses, seals or electrical parts remain in good condition. If the machine was stored in freezing, damp or flooded conditions, ordinary cleaning is not a substitute for appropriate assessment.
A useful next step
Check accessible signs of damage without pulling the machine apart. Follow only the documented recommissioning or maintenance steps for the model. Mention the period and conditions of non-use when booking, and do not run repeated cycles through a machine that leaks or trips.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.