Okay, I replaced the thermostat and it is still not working.
Did you check the old one before replacing it?
Was it blown?
I checked the heating filaments and they work fine. I haven't replaced the sensor, but I'm assuming the oven would heat up even if the sensor was not working.
Depends what is wrong with the sensor.
If the sensor is giving an incorrect reading then the control board could think that the unit is up to set point temperature and therefore does not turn the elements on.
The fan kicks on and makes all of the noises like it is heating, the oven tells me it has heated up to 350 degrees, but there is no heat.
If the sensor resistance is about 1,100 at room temperature then odds are that the control board is shot.
Unit thinks that the oven is at set point when it is not.