Step1: Turn off gas and electrical power to the unit before servicing.
Step2: Allow burner area to cool completely.
Step3: Remove burner access panel to expose flame sensor placed.
Step4: Disconnect wiring from existing flame sensor terminal.
Step5: Remove faulty sensor from mounting bracket.
Step6: Install new probe flame sensor in correct position near flame path.
Step7: Reconnect tab terminal securely and ensure proper grounding.
Step8: Restore power and gas, then check stable flame detection during ignition cycle.