Look for signs of improper combustion

technicians should always verify cross-reference data and 24V circuit compatibility before installation in non-Lennox equipment

While primary used as a spark ignitor

This burner safety control manages the motor

this is a dedicated 4-pin harness

Lennox 17F50 Header Box Kit 318973-401 Look for signs of improperThe Lennox 17F50 Cold End Header Box Kit is a critical OEM replacement part designed for high efficiency 90% AFUE and above condensing gas furnaces. As a primary collector box assembly, this kit manages the corrosive condensate generated during the heat exchange process, preventing fluid backup that can lead to pressure switch trips and furnace lockout. This heavy duty header box kit (Lennox 619598 46) is engineered for a precise fit on EL296, ML195,