No, it is not normal for a healthy residential kitchen oven to have an internal temperature variance exceeding 25 degrees Fahrenheit from your set temperature, as this will consistently ruin baked goods and meats. While minor temperature cycling of 10 to 15 degrees is standard as the heating element turns on and off to maintain heat, a persistent 25-degree discrepancy indicates a failing temperature sensor probe, a warped heating element, or a miscalibrated control board. You can troubleshoot temperature calibration easily with a hanging oven thermometer. You can verify that your corrective action is successful when adjusting the temperature offset in your control menu or replacing a faulty sensor probe restores accurate thermal cooking performance.
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