Lennox Furnace Igniter Parts

Lennox Furnace Hot Surface Igniter Parts

When your Lennox furnace ignites then shuts off within seconds, or the igniter glows orange but refuses to stay on, the hot surface igniter has likely failed. This ceramic part draws electrical current to heat up and ignite the gas — when resistance drops or the element cracks, ignition fails and your furnace won't produce heat. Lennox igniters are available in specific types (SiN and SiC carbide), and getting the exact OEM match for your model ensures reliable ignition and proper gas valve timing.

The igniter is one of the most common Lennox furnace repairs. OEM Lennox igniters are engineered to the exact resistance specifications your control board expects — aftermarket or mismatched igniters can cause delayed ignition, nuisance shutoffs, or complete heating failure. Our Lennox furnace igniter parts inventory covers SLP98V, EL296V, ML296V, and other popular Lennox models.

• Igniter glows but furnace won't heat: Low resistance or a weak filament; OEM replacement needed
• Furnace clicks but igniter never glows: Open element or broken wire; verify 24V at the igniter terminals first
• Intermittent ignition or delayed flame: Cracked ceramic; even small cracks reduce heating speed
• Control board won't fire igniter: Verify igniter resistance with a multimeter — out-of-spec igniter won't trigger the valve
• Yellow or uneven flame after igniter lights: Igniter position or combustion air flow issue; ensure correct OEM igniter type

Lennox Furnace Igniter FAQ

What's the difference between SiN and SiC igniters on Lennox furnaces?

Silicon nitride (SiN) and silicon carbide (SiC) igniters heat to different temperatures and have different electrical resistance profiles. Your Lennox model uses one specific type — using the wrong type will prevent reliable ignition or cause the control board to reject it. Always verify the igniter type in your manual or by model number lookup before ordering. Mixing types can damage the gas valve or control board.

How do I find my Lennox furnace model number for the correct igniter?

The model number is on the yellow EnergyGuide sticker on the furnace cabinet, or on the metal nameplate near the door. It typically starts with SLP, EL, or ML. Once you have the model number, enter it in our parts finder — we'll confirm the exact igniter type and any wiring specifics. Lennox uses proprietary igniter connectors on some models, so the model number lookup is critical.

Can I clean or test my Lennox igniter instead of replacing it?

Unlike flame sensors, igniters can't be reliably cleaned or repaired. If the element has cracked or the resistance has drifted out of spec, it must be replaced. You can test it with a multimeter: disconnect power, measure resistance across the terminals (typical range 40 to 100 ohms for Lennox igniters). If you see infinite ohms (open circuit) or very low resistance, replacement is a primary fix. If the igniter glows but won't ignite gas, verify 24V control signal and gas valve operation — the igniter itself may be good but the valve or pressure switch could be the real culprit.

Why does Repair Clinic only carry OEM Lennox igniters?

Lennox is a factory-certified brand with stringent equipment matching. Aftermarket igniters from unknown suppliers often have incorrect resistance, poor ceramic quality, or incompatible connectors. A failed aftermarket igniter can stress your control board or cause gas valve wear. OEM Lennox igniters are tested and engineered to match your exact furnace model — that's the safest, most reliable choice for your heating system.

Fast and Reliable Online Ordering for Lennox Furnace Igniter Parts

Shopping for Lennox furnace igniter parts is a breeze with Repair Clinic. Our easy-to-use model number lookup tool simplifies finding the exact replacement part you need, ensuring your furnace is up and running in no time. With our No-Hassle 365-Day Returns, you can return any uninstalled part within a year for a full refund, supported by model-number lookup and return options. Plus, our Price Match Guarantee ensures you get the best price on genuine OEM parts. Order by 9:00 PM ET, and we'll ship your parts the same day, making repairs quick and efficient. Trust Repair Clinic to provide you with the parts and support needed to keep your Lennox furnace operating smoothly.

Lennox Furnace Model Number: Where to Look

On Lennox furnaces, look for the model number on the yellow EnergyGuide label attached to the cabinet or on the metal nameplate near the front access door. You may need to remove the access panel to read the full number, which often begins with letters such as SLP, EL, or ML. Record every letter, number, and dash exactly as shown. Type it into the search bar, and the catalog will narrow to parts made for your complete furnace model, not just one part. Using the full model number helps account for differences in igniters, controls, and other associated parts, so you can identify a compatible replacement without sorting through mismatched options. No cross-checking specs, just the right parts for your model.