All Ecodesign regulations include an Annex that describes the procedure of verification of compliance by market surveillance authorities and sets the tolerance margins for the relevant parameters of the product which can be used by Member States authorities. These tolerance margins shall not be used by the supplier as an allowed tolerance margin for declared values. The declared values and classes on the label or in the product fiche shall not be more favorable for the supplier than the values reported in the technical documentation.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.