When we set the temperature - it will not heat past 250 degrees (display is digital). Have tried resetting the power but still 250 is max. The broiler works fine. I suspect if one of the elements were bad it would still heat up but take longer?
Thermostat or sensor issue perhaps?
Thank you for any help
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It could be a bad bake element Some units will hit set point with one element, others will not.
You specifically said the broil comes on but did not mention the bake so I am assuming it does not come on.
So if the broil cycles on/off during preheat and the bake does not come on then I would check the bake element.
Does the unit have an indicator as to when it is ready?
If it does and the oven comes ready then a sensor or control board could be the cause.
If it stays in pre-heat then it is probably the element or the control relay/control board for that element.
Here is a good link with basic info.
http://www.applianceaid.com/elecrange.html
If you think it is the oven sensor check out 7, 8, 20 and 21.
Thank you for responding so quickly.
The temperature display is digital.
Today I did a few tests to get you more information.
Test one - set bake temperature to 300 - it automatically dropped to 100 degrees (where it normally starts out at) and only a trickly of heat evident. After 15 minutes never rose above 100 degrees (display) and hardly any heat.
Test two - Set Broil to High. Upper element turned red and worked properly.
Test 3 - After 15 minutes - switched to bake mode and set temperature over 400 degrees and oven did not heat past that.
So in conclusion - the temperature display appears to work fine as it does register the heat fromt he broiler.
Thanks again for the advice 
Since the unit reads the temperature correctly the sensor is OK.
I would pull the bake element and check it with a meter.
If OK open the unit up and check the wiring from the control board to the elements.
If OK odds are that the control board is toast.
The unit does have a hi-limit thermostat but looking at the wiring diagram it should kill power to both elements.