OEM Lennox Ignitor & Flame Sensor Kit — 27L41

The 27L41 is a genuine OEM Lennox ignitor and flame sensor assembly kit. The hot surface ignitor glows red-hot to light the burners on a call for heat, while the flame sensor confirms the flame is actually present so the control board keeps the gas valve open. Together they form the ignition and safety loop at the heart of your Lennox gas furnace's heating cycle.

Common failure symptoms: no heat with the ignitor failing to glow, the furnace lighting then shutting down after a few seconds (flame sense fault), repeated ignition retries and hard lockouts, or short-cycling on cold mornings. A cracked or worn hot surface ignitor and an oxidized flame sensor are among the most common causes of a no-heat call.

Why OEM matters: the 27L41 ignitor is engineered to the exact voltage, resistance, and mounting position your Lennox burner assembly requires, and the flame sensor is matched to the control board's microamp sensing threshold. The genuine kit drops in without adapters and restores reliable, first-try ignition. Universal ignitors often run hot, crack early, or seat incorrectly, leading to repeat failures. Replace both parts together with the factory kit for a lasting, trouble-free repair.