GE Single Wall Oven JT3000SF6SS overheating

[Guaro DC]

The oven continues heating after reaching the target temperature set in the display board, ending with the error code F20 due to overheat. 

When this occurs, the oven does beep when it reaches the target temperature, as it should do it, but the heating element continues on, though the display is not updated with the higher temperatures. After some time, the oven displays the error F20 due to overheating. 

I took out the temperature sensor and found it in good shape visually. Also, using a multimeter confirmed a resistance of 1086 ohms at room temperature. 

I'm trying to determine my next course of action. Would the control board be the culprit, or something else?

Appreciate the advice. 

[Guaro DC]

Forgot to mention that the problem occurs randomly which makes troubleshooting more problematic. Most of the time the oven works well until the issue reoccurs after several uses. 

[Daniel.A]

Since you've verified that the sensor is where it should be, the only other component that dictates when the element goes on and off is the board. Sometimes, the relays in the board get stuck or fused together, and will cause the element to remain on. At this point, I would replace the board. Looks like the part number is: WB27X29607.

[Guaro DC]

Thank you for the advice @Daniel.A. I'll proceed with the board replacement.

A follow up question, does the control overlay need to be replaced along with the board, or can the existing one be retained? 

[Daniel.A]

@Guaro DC The existing overlay should work. Looks like the board I listed has the buttons on the board itself, then a plastic overlay that depresses the buttons on the board. Then you have the user-facing overlay which sits on top of that.

[Guaro DC]

Thank you @Daniel.A I just ordered the board you listed and will be working on replacing it next week. I will revert with the results!