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Below I created a list of three common problems that may be the cause of your problem.
Faulty Temperature Sensor
Newer style ovens with an electronic range control (ERC) utilize a temperature sensor inside the oven to regulate heating. This sensor controls the cooking modes and usually the self-cleaning mode on those models that have the option.
The sensor has a very specific internal resistance that changes along with temperature. The sensor goes bad when its resistance is changed through a faulty internal connection or internal short.
How to Diagnose?
You can remove the sensor and check its resistance. It should read about 1100 ohms at room temperature. If the reading is off more than about 50 ohms, replace the sensor.
Faulty Thermostat
Some ranges and ovens utilize a manual style thermostat (electronic systems utilize a sensor). These thermostats do not keep the temperature perfectly set to a given temperature. There can be a range as much as a 20 to 25 degree Fahrenheit range above and below the set temperature that the oven will actually fluctuate.
If when using a high quality oven thermostat to measure the oven temperature, you see a temperature fluctuation higher than 25 degree above or below the set temperature, it is likely that you need to replace the thermostat.
Faulty Control Board
Ovens that utilize a sensor require some electronics to interpret the sensor data and to take appropriate action to raise or lower the temperature in the oven. There are several configurations of this electronics. There are some electronic range controls (sometimes called ERC's or clocks) that have the logic and relay boards combined into a single unit. Others have a logic board that is separate from the relay board.
If your oven will not keep a consistent temperature and you have verified that the sensor is not faulty, then one of these control boards could be faulty. The easiest way to tell is if the electronic range control is throwing a fault code.
If it is not throwing a Fault Code, then you may be able to test the board(s) with the aid of a diagnostic sheet. This sheet is often located in an envelope that is located inside the cavity of the control panel. These diagnostic sheets are very model specific and usually provide voltage and resistance meeting that can be taken across test points on the boards.
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