A good oven should not do this, but some ovens may turn on the grill even when heating up the oven normally (non-pre-heating), to make it heat up faster from room temperature. The warning in the picture in the Question also says "do not use under a direct heat source".Īnother (weaker) hypothesis: they interpreted the French correctly. This function uses the grill on the "ceiling" to make it heat up extra fast (in addition to the normal heating element located outside the internal oven compartment), and this would result in too much direct heat on the pan. The latter would make sense: pre-heating is a special function in many ovens with its own button. It could be interpreted in two ways: "always preheat the oven if you're going to use the pan in it", or: "always preheat the oven before putting in the pan, not after putting in the pan". This means, "make sure to always preheat the oven before putting in your pan". It says, again thanks to Fabby:Īssurez-vous de toujours préchauffer le four avant d’y mettre votre plat en vitre. ![]() An hypothesis: they misinterpreted the French original written by Pyrex. As Fabby says, it must have something to do with a sudden change in heat.
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