Lennox 56K26 Flue Box R-410A This often indicates a stuck-closed

This often indicates a stuck-closed blower relay on the control board or a safety limit that has tripped and remains open

the inducer motor running without the igniter sparking

Versatile Application: Suitable for a wide range of propane or natural gas appliances

Its manual travel stops allow for +/- 5 degree adjustment at both ends of the stroke

Lennox 56K26 Flue Box R-410A This often indicates a stuck-closedThe Lennox 56K26 Flue Box (also identified as LB 79560) is a critical OEM replacement part engineered for high efficiency gas furnaces and boilers. Constructed from corrosion resistant stainless steel, this collector box is designed to manage the transition of combustion byproducts, ensuring that exhaust gases are safely and effectively channeled from the heat exchanger into the venting system. For a veteran technician, the 56K26 represents a reliable