Hi there the F30 error means the computer is sensing an open temperature sensor, open the oven door and the temp sensor is the probe sticking out of the back of the oven. Some models have screws that hold it in place in the back of the oven in which you just remove the screws and pull the probe out and unplug it from the wiring harness, if there are no screws on the temp probe bracket in the oven then you will have to remove the panel off the back of the range and access the temp sensor from the rear. If you have a meter you can test the probe it should read around 1100 ohms at room temperature, if not then the probe needs to be replaced. If you do not have a meter , since you have already changed the control board which is the only thing that could cause this error, just replace the temperature sensor:
Range Oven Temperature Sensor
Part #:###-##-####click here
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