OEM Lennox Hot Surface Ignitor — 98P78

The genuine OEM Lennox 98P78 hot surface ignitor glows red-hot to light your furnace's gas burners at the start of every heating cycle. Built to Lennox factory specifications, it delivers the precise resistance and operating temperature your furnace control board relies on for safe, consistent ignition throughout the heating season.

Because the ignitor element endures thermal stress on every cycle, it is a frequent wear item. Signs your 98P78 needs replacement include a furnace that runs the inducer and blower but produces no heat, repeated ignition lockouts, a cracked or discolored element, or a unit that only lights intermittently. A visual crack in the element almost always means it is time for a new ignitor.

Installing an OEM Lennox 98P78 ensures correct fit and electrical characteristics. Universal or aftermarket ignitors can draw the wrong current, sit at the wrong angle to the burner, or fail early — leading to no-heat calls in the middle of winter. The factory part restores dependable ignition and correct flame sensing for your Lennox furnace.