The F1 code indicates a control failure. Try pressing a key to see if it displays on the screen. If not, the keypad may have shorted and requires replacement. If the keypad is fine, there is perhaps a problem with the internal checksum; disconnect the power for 30 seconds and reconnect it. If the code remains, you must replace the electronic oven control (EOC). If the F1 code appears when the oven is running, it means that the oven senses an overheating condition. Use an external thermometer to check the temperature inside the oven. If it is accurate, it means that either the temperature sensor probe or the control relay has malfunctioned. Disconnect the power, and inspect the sensor probe, replacing it if necessary. If the oven is actually overheating, replace the EOC. If the oven is allowed to overheat, the resulting damage is possibly so extensive that the entire oven may require replacement.