Step1: Turn off gas supply and disconnect electrical power to the oven.
Step2: Remove the control panel to access the existing flame switch.
Step3: Label and disconnect wires from the faulty switch.
Step4: Unscrew and remove the old switch from its mounting position.
Step5: Install the new switch and secure it with mounting screws.
Step6: Reconnect wires to matching terminals.
Step7: Reassemble the control panel and restore power and gas.
Step8: Test the oven to confirm proper flame ignition and switch operation.