Common causes include voltage spikes

The orifice includes an integrated dirt-protection filter to prevent debris from compromising the valve seating

this unit is recalibrateable through a simple case adjustment

This OEM replacement part is engineered for precision

it can be used across various manufacturer platforms

Lennox 98P78 Hot Surface Ignitor Els PW 17895 Common causes include voltage spikesThe 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