The screen that you use when setting the oven temp is reading "20" and none of the buttons work, it is Christmas eve and nowhere is open and I can't find my manual... HELP!

The thermostat is mechanical using pressure from a waxstat style sender and is not adjustable.
I expect you are measuring with your probe in a different place to the sender unit; hence the differences.

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If you have multiple elements it is possible that one may be burned out and limiting the high end of operation.. Check all to make sure that none is open and replace as necessary.

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Hi

This Error indicates a loose/broken wire on the oven temp sensor or the oven temp. sensor itself is bad and should be replaced. To solve this issue test the oven temp. sensor, it should read between 1080-1120 ohms, if the rating is more then that and the door appears to be closing fine then it is the control board that is bad and should be replaced. Hope this helps...please post back for further assistance.
Daniel

Hi

This means a loose/broken wire on the oven temp sensor or the oven temp. sensor itself is bad and should be replaced. To solve this issue test the oven temp. sensor, it should read between 1080-1120 ohms, if the rating is more then that and the door appears to be closing fine then it is the control board that is bad and should be replaced. Hope this helps...please post back for further assistance.
Daniel

hold the clock button in for 3 to 5 seconds

Sorry to read about your problem, I hope this helps you out.

your F3 means: Oven temperature sensor open you cannot reset this type of problem.

Check oven temperature sensor, should be ~1100 ohms at room temperature. If too high or low, replace oven temperature sensor

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I read the User's Manual/

I turned off circuit breaker to the oven and tried to open it. It did not. I did it again and waited for a few minutes, it worked and I was able to open the door.

electric oven heats to correcect temp then drops and does not get back too appropriate temp. For example, set at 400, gets there then drops to 275-300