oven won't heat below 450.

I was using my oven earlier and I noticed that the heating element was not staying on. I turned my oven up to 450 F and it came back on. Now the element won’t turn on unless the degree is 450 F or higher. Does anyone have any ideas what might be causing the problem or how it can be fixed?

Cannot find any info on the given model number.

The unit may think that it already at a high temperature.
Check the oven sensor (se below) for resistance.
Also check that the sensor connector are clean and not corroded.

Here is a good link
http://www.applianceaid.com/elecrange.html
Check out 7, 8 and 21

If OK odds are high that the control is gone