Ovens naturally drift out of calibration over time. Before assuming something's broken, measure the actual temperature and recalibrate from there.
Measure With a Separate Thermometer
The number on the display is only as accurate as the sensor feeding it.
Fix: Hang a standalone oven thermometer in the center rack and compare it to the setpoint after a complete preheat.
Use the Calibration Offset
Nearly every oven lets you nudge the displayed temperature up or down from the settings menu.
Fix: Dial in an offset to close the gap you measured — typically within about ±35°F.
Replace a Failing Sensor
A gap that's large or inconsistent from bake to bake points to a sensor that's actually failing, not just drifting.
Fix: A replacement sensor is a low-cost, routine repair.
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