Replacing element in oven

if it is an electronic timer temp controller you might want to check it

have you checked with an oven type thermometer for 350 degrees against the setting of 350 degrees,if its off very far then its the oven temp sensor in the upper left middle or right rear wall of the oven thats bad it looks like a small pencil type rod 2" to*' long it merely unplugs off the oven s control panel in the rear,you can test its resistance also to get an idea if it is your culprit,otherwise the oven element could have a hot spot in it and not letting all the current thru to properly heat the element,it will be dis-colored in that area

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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either its the oven sensor rod located at the top of the ovens cavity,or your bake element could be getting a hot spot which is when it gets a discolored spot in the element and can no longer pass sufficient current to heat the oven past 250 degrees

It is a problem with neither of the two it is the sensor reads the oven temp and shuts off the heating element when it is reached, it is called the thermal probe or thermostat.

F3 usually means, that the oven temp. sensor is bad and one need to replace it.
The fact, that it's not heating tells me, the fuse in the back also needs to be replaced (requires pulling out).

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The oven probably got switched from showing degrees Fahrenheit to degrees Celsius. (350 F = 177 C.) Try resetting that before you replace any parts.

Technician just left our house with same issue. Jenn-Air had issued a technical bulletin as the temperature probe is mounted directly to the heating element, and measures the heat of the element, not the oven. Their fix is a revised temperature probe that goes at a 90 degree angle away from the heating element.

If your temperature is consistent, just off by a set amount of degrees, there is an adjustment you can make at the control panel.

the temp probe ( rod sticking out of rear wall inside oven ) should ohm out at 12-1300 ohms at room temp. the other possible cause is the heat relay on the control board is bad .this does not display a fault code.

Check the BACK of your temperature knob for an adjustment. I was ready to replace my heating elements when I accidently discovered the adjustment. Made the adjustment and no more problems. My oven now stays within 4 degrees of settings.