OEM Lennox Spark Electrode Ignitor — 17J57

The genuine OEM Lennox 17J57 spark electrode ignitor generates the high-voltage spark that ignites the gas at the burner during each heating cycle. Positioned at a precise gap from the burner, the electrode creates a reliable arc when energized by the control board, lighting the pilot or main burner for start-up. Correct electrode gap and ceramic insulator integrity are essential for consistent ignition.

Common failure symptoms: A worn or cracked 17J57 spark electrode commonly causes ignition failure, repeated clicking with no light-off, delayed ignition followed by a small "whoomph," or intermittent no-heat calls. A cracked ceramic insulator can leak spark to ground, and an eroded electrode tip widens the gap until the arc can no longer bridge to the burner.

Why OEM matters: The Lennox 17J57 is manufactured with the exact electrode length, gap, and insulator rating your ignition system requires. Aftermarket electrodes with slightly different geometry can misfire, ground out, or fail early. Installing the factory part ensures a strong, correctly positioned spark for dependable, safe furnace ignition.