Lennox 51M93 Ignitor

The Lennox 51M93 Ignitor (also identified as Lennox 51M9301) is a high-performance hot surface ignitor engineered for precise ignition in HM61 series water heaters and select Lennox gas furnaces. Manufactured with durable silicon carbide (equivalent to Norton 201Q), this component is built to withstand high-thermal stress and repeated cycling without the premature oxidation common in lower-grade aftermarket alternatives. As an OEM replacement part, it ensures proper resistance values—typically between 39 and 70 ohms—which is critical for preventing E207 error codes or "open ignitor" faults on the SureLight ignition control board.

For field technicians, the Lennox 51M93 provides a direct fit with a 19-5/8 inch lead length and a standard spade connector, eliminating the need for splicing or harness modifications. This 120V gas furnace ignitor produces the rapid, high-temperature glow required for immediate combustion, reducing delayed ignition "booms" and ensuring system efficiency. When performing a Lennox 51M9301 replacement, always handle the element by the ceramic base to avoid transferring skin oils, which create hot spots and lead to localized fractures on the silicon carbide ignitor surface.

• Direct OEM Compatibility: Specifically calibrated for Lennox HM61 systems and furnace models requiring the 51M93 or 51M9301 catalog numbers.
• High-Temperature Durability: Robust silicon carbide construction manages 120V loads and high-wattage heat cycles for consistent burner startup.
• Universal Integration: Replaces part numbers used across Allied, Armstrong, Concord, and Ducane equipment for broader service truck versatility.
• Reduced Troubleshooting: Matches factory resistance specifications to satisfy control board self-diagnostics and prevent lockout scenarios.

What resistance should I see when testing the 51M93 with a multimeter?
A functional Lennox 51M93 ignitor typically reads between 40 and 75 ohms at room temperature. A reading of "OL" (infinite resistance) indicates a cracked element that must be replaced.

Can I use this ignitor as a universal substitute for other silicon carbide parts?
While the 201Q element style is common, this part is specifically leads-matched for Lennox systems. Verify your mounting bracket and connector type before installation to ensure a safe, secure fit.

Why is my new ignitor failing shortly after installation?
Premature failure is often caused by touching the heating element during installation. Skin oils carbonize under high heat, creating a failure point. Use the ceramic base for all handling.

This item is not eligible for free shipping.

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.