Common Whirlpool oven problems with temperature include inaccurate heating, not reaching set temperature, and overheating. The most frequent issue is oven not reaching set temperature or taking too long to preheat, where oven set to 350 degrees only reaches 300 or takes 30 minutes, often caused by failed bake element for electric models that is partially burned out and heating weakly, or weak igniter for gas models that glows but does not fully open gas valve after 3 to 6 years, or failed temperature sensor at back wall that reads incorrectly. Second, oven overheating or temperature too high by 25 to 75 degrees, causing food to burn, due to stuck relay on control board or shorted temperature sensor that reads low and causes board to overheat. Third, uneven temperature with hot spots causing uneven baking, due to worn door gasket leaking heat, failed convection fan not circulating air, or calibration drift after years of use. Fourth, temperature fluctuating during bake cycle, due to loose sensor wiring or failing control board. To diagnose, use oven thermometer placed in center rack and set to 350 degrees, after 20 minutes check thermometer reading, if off by more than 15 degrees, calibrate via control panel by pressing Bake and adjusting offset, or replace temperature sensor at 15 to 40 dollars. If still off, control board may need replacement.
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