The invention relates to a method for controlling confined preforms which are stopped in a heating station during a production interruption, the heating station comprising a device for conveying preforms comprising individual supports which move in a closed circuit and a heating cavity which is bordered by at least one row of transmitters of monochromatic electromagnetic radiation. The method includes a step of heating, by the transmitters of the heating cavity, the confined preforms referred to as “cold” preforms which have been stopped before being exposed to the electromagnetic radiation emitted by the transmitters.