OEM Lennox Hot Surface Ignitor — 75M72

The 75M72 is a genuine OEM Lennox hot surface ignitor designed to light the gas burners in your Lennox furnace on every call for heat. When the thermostat signals for warmth, the control board energizes this ignitor until it reaches ignition temperature, safely establishing the burner flame. As a factory component, it is engineered to match your furnace's exact electrical and mechanical specifications.

Common failure symptoms: the furnace runs its ignition sequence but never lights, the blower delivers cold air, the system locks out after multiple failed attempts, or the ignitor no longer glows when the burners should fire — often the result of a cracked or worn element.

Ignitors are among the most commonly replaced furnace parts because the heating element becomes brittle and degrades over years of thermal cycling. Choosing the OEM Lennox 75M72 ensures correct resistance, glow temperature, and a proper fit, preserving the control board's ignition timing and restoring safe, dependable heat to your home.