What is 予熱 on an oven?

Some one help me with this.
I have one of those annoying microwave oven things here.
予熱 I translate as pre-heat, is this right?
Why when I press 予熱 and let it pre-heat, when it comes time to put my food in it says ‘over heated’ as in 冷却中. Isn’t the point of pre-heating to make it hot?
Thank you!

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