Lennox 80M29 Ignitor

The Lennox 80M29 Ignitor is a heavy-duty hot surface ignitor engineered for precise ignition in Lennox gas furnaces, as well as select Armstrong and Ducane heating systems. Functionally identical to the 80M2901 and often used as a direct OEM furnace replacement part for the 20434202 and 28M96, this component features a silicon nitride element known for superior thermal shock resistance compared to older silicon carbide versions. This 120V ignition assembly includes a pre-mounted bracket and a 2-pin connector for a streamlined fit into the burner transition. For field technicians, verifying ignitor continuity is a standard diagnostic step; a functional 80M29 typically displays a resistance range between 30 and 200 ohms depending on ambient temperature. Using a genuine Lennox ignitor ensures the combustion sequence timing remains within factory specifications, preventing delayed ignition or nuisance lockouts in high-efficiency AF90 and AF80 series models.

• OEM Compatibility: Exact replacement for 80M2901, 28M96, and 20434202, ensuring no modification to the mounting plate is required.
• Durable Construction: Built with high-grade materials to withstand rapid thermal cycling and extreme furnace cabinet temperatures.
• Optimized Performance: Provides a high ignition success rate, reducing start-up lag and wear on the ignition control board.
• Efficient Installation: Features a dedicated 2-pin terminal connection and fixed bracket for rapid field replacement during service calls.

How do I test if my Lennox 80M29 ignitor is bad?
Perform a resistance test using a multimeter. If the meter shows "OL" or infinite resistance, the element has a hairline fracture and requires replacement. A healthy Lennox 80M29 should read approximately 30-200 ohms.

Can I touch the ignitor element during installation?
No. Skin oils can create hot spots on the surface of the silicon nitride element, which leads to premature failure. Always handle the part by the ceramic base or the wiring harness.

Is the 80M2901 the same as the 80M29?
Yes, the 80M2901 is the manufacturer part number for the Lennox 80M29. They are technically identical and interchangeable in all listed applications.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.