Hi,
Electronic ovens with a digital display use a sensor to monitor oven temperature. To solve temperature problems for these models, you need to replace the sensor. On some digital-display models, you can calibrate the temperature using the key pad. See your operator's manual for details.
Ovens without a digital display often use a mechanical system for controlling temperature. On many of these units, you can remove the thermostat knob and adjust the knob itself to more accurately represent the actual setting of the thermostat.
When you remove the knob, there's a screw on the back of it with a small calibration plate, you can loosen the screw, adjust the plate, and then tighten the screw again. If the knob isn't adjustable, and the oven temperature is off by more than 30 to 40 degrees, you need to replace the thermostat to solve the problem.
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