My electric oven will not stay on past 100 degrees

sounds like you have a problem with the thermostat that you need to check out. If the oven shuts off totally then you have some other electrical problem.

Stove will not turn off CHECK
Temperature Control Thermostat
If the oven won't turn off the oven thermostat is often the cause of the problem. The electrical contacts inside the oven thermostat can weld themselves together and then the oven won't turn off. If this happens, turn off power to the entire appliance at the household circuit breaker or fuse. The oven thermostat usually cannot be tested and must be replaced if defective.
Oven Control Board
The oven control board has a set of relays that turn on and off power to the bake and broil circuits according to the customer settings and sensor input. If the oven won't turn off it could be that one of the relays on the oven control board is shorted closed, providing voltage to the heating circuit. It can be dangerous if the oven won't turn off. Don't leave the oven unattended without turning off power to the oven.
Relay board:
Some ovens are equipped with a relay board. This circuit board has several relays which control the switching of electrical current to the oven heat source. If the oven won't turn off it may be that one or more of the relays on the relay board have failed. If this happens replace the relay board. The relays on the board are not sold separately. ALSO CHECK THE BAKE AND BROIL ELEMENT.
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It is normal for the thermal device to turn on and off. Obtaining a steady temp is not always possible. When setting a temperature on some ovens, they have what is called a tolerance point. That means a set temperature has a range of a few degrees up or down. At the Down point, the oven is triggered to energize the coils and bring the interior of the oven back to the settings desired. The other factor is opening the oven and allowing cool air to enter, or in some cases a leaking door seal allows air to enter and heat to escape.

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Hi,

Here is a tip that I wrote about the problem of the cooktop light staying on.

Oven Hot Surface Indicator Light stays on

heatman101

I too have just had this problem. The door switch (top right corner) is broken and the oven thinks the door is always open. Chances are it won't heat up either.

Yes, this is most likely a thermostat problem. If you have tried every temp level below 400 and it will not come on until you reach 400 on the dial, then you most likely have a temp sensor switch/ thermostat problem.
I had to assume alot of things here:
1. It is an electric oven.
2. Once you get the oven to start at the magic number and try to dial down from there, the oven turns itself off.
3. It will start up as long as the temp is first set at 400 degrees or higher.

if its going out, its probably ok
its not a light indicating the burner is on, rather that the glass is abcove 100 degrees and still not safe to put something on
2 hours is a bit long but it depends on how fst the surface can cool of
you can test this by trying to cool it off faster with a fan ans see what happens

Test the swtich w/ multi tester /connect tester as a jumper to the switch dettach one line on and off switch /if does not reponse / replace the switch.