Testing a residential oven thermostat or temperature sensor probe involves performing an objective thermal accuracy test and a multimeter resistance check. First, place an independent oven thermometer in the center of the cavity, set the oven to 350 degrees Fahrenheit, and compare the actual reading after twenty minutes; a variance exceeding 25 degrees points to a failing sensor. Second, disconnect power and test the sensor resistance with a digital multimeter set to ohms. You can troubleshoot temperature faults safely. You can verify that your sensor is bad when the multimeter reading deviates wildly from standard room-temperature resistance specifications, confirming you must replace the sensor probe to restore accurate baking temperatures.
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