Susan Reid, post author

February 15, 2015 at 6:33pm

Hi, Pibby. I hate to say it, but your service tech is mostly right. The techonology for thermocouples (the device that tells the heating element to come on) is basically a spring that expands and contracts with temperature changes. The normal range above and below a set temperature is 35°F. So a 70°F swing is, in fact, normal. For that reason I am not at all a fan of recipes that tell you to open the oven door and rotate pans. The best assurance of even heating is in good insulation and the discipline of keeping the door closed. Susan
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