Step1: Turn off gas supply and electrical power to the unit before servicing.
Step2: Allow appliance to cool completely to avoid burns.
Step3: Remove front or side access panel to reach gas control area.
Step4: Label and disconnect inlet, outlet, and pilot tubing carefully.
Step5: Remove existing safety control valve from mounting position.
Step6: Install new valve, ensuring correct gas flow direction.
Step7: Reconnect all gas lines securely and check for leaks with approved solution.
Step8: Restore gas and power, then test ignition and check better shutdown function.