Step1: Turn off gas or power supply and ensure the equipment is fully cool before starting.
Step2: Remove the control panel or front access area to reach the existing valve assembly.
Step3: Label and disconnect all gas line and control connections from the old valve carefully.
Step4: Unscrew and remove the faulty valve from the mounting and pipe connections.
Step5: Install the new valve assembly, aligning threads and tightening securely to prevent leaks.
Step6: Reconnect all lines, check for gas leaks with approved solution, and test burner operation before returning to service.