Do I have to prove the product was faulty from the start?

No, not in the first year. A lack of conformity that becomes apparent within one year of delivery is presumed to have existed at delivery, unless the seller proves otherwise or the presumption is incompatible with the nature of the goods or the fault.

Member States may extend this period to two years, as several have done. After it ends, you must show that the fault was there at delivery.

Directive (EU) 2019/771 (Sale of Goods Directive), Article 11 · European Commission and the national consumer authorities

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