Faults are often caused by a failing inducer motor

eliminating the safety risks associated with "universal" adjustables that often fail to meet the delicate tolerances required for high-efficiency condensing furnaces

they are interchangeable part numbers for the same Genuine Lennox sensor

1" diameter crankcase

Lochinvar & A.O. Smith 100135290 Burner Assembly 30067439-890 Faults are often caused byThe Lochinvar and A. O. Smith 100135290 Burner Assembly is a direct OEM replacement engineered for high efficiency commercial water heaters and boilers. This assembly, cross referenced as BNR3400, features an integrated pressure tap for precise manifold pressure adjustments and diagnostic testing. Designed for optimized gas air mixing, this replacement burner assembly ensures stable flame patterns and consistent thermal output in demanding hydronic