Lennox 98P78 Hot Surface Ignitor

The Lennox 98P78 Hot Surface Ignitor is a critical OEM replacement component designed to ensure consistent glow ignition in residential gas furnaces. Also identified by the part number 98P7801, this 120V silicon carbide igniter is engineered for high-temperature durability and rapid thermal response. As a ceramic block-style Type B ignitor, it serves as a direct drop-in for various Lennox HVAC systems, as well as specific compatible units from Rheem and Trane. Featuring a 5 1/4-inch lead length and manufactured by White Rodgers (767A-372), it provides the precise amperage draw required by the furnace control board to prevent nuisance lockout codes. When troubleshooting a furnace not blowing hot air or experiencing ignition failure, replacing a cracked or oxidized 98P78 element is a standard procedure for restoring reliable burner cycles. This OEM furnace part maintains the intended sequence of operation, protecting the gas valve and heat exchanger from delayed ignition issues.

• OEM Compatibility: Guaranteed fit for Lennox systems requiring part numbers 98P78 or 98P7801.
• Direct Replacement: Matches White Rodgers 767A-372 specifications for seamless electrical integration.
• Durable Material: Constructed with high-grade silicon carbide for superior thermal shock resistance.
• Optimized Lead Length: Includes a 5 1/4" wire lead for easy routing to the ignition control module.
• System Reliability: Prevents common E292 or "burner failed to light" error codes on the diagnostic board.

Is the 98P78 interchangeable with 98P7801?
Yes, the 98P78 is technically identical to the 98P7801. They are the same OEM component and are fully interchangeable in all supported Lennox applications.

What are the signs that my Lennox ignitor has failed?
The most common symptoms include the furnace's induced draft motor running without a visible orange glow from the ignitor, or the furnace cycling through several ignition attempts before entering a "lockout" mode.

Can I touch the black element during installation?
No. You must handle the ignitor only by the ceramic base. Skin oils can create "hot spots" on the silicon carbide surface, leading to premature structural failure of the element during a heat cycle.

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.