An oven cavity which reaches the temperature setting of the thermostat within the duration of the test cycle even only for a short time satisfies the specific criterion set out in Annex II (1) of the Regulation (“that the temperature inside the oven cavity reaches the temperature setting of the thermostat and/or the oven control display within the duration of the test cycle”).
However, this behaviour is not considered to be consumer-friendly and this issue should be addressed in standardization and/or in the upcoming review of the regulation.
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.