When the York furnace flame sensor detects a stable flame

this motor ensures the safe evacuation of flue gases from the heat exchanger

Dead-End Lock-Up: Provides a bubble-tight shut-off to protect downstream components from over-pressurization

consistent pilot flame that maintains proper thermocouple heat saturation for reliable gas valve operation

it is best practice to replace the gasket whenever the head assembly is removed from the bowl

Lochinvar & A.O. Smith 100109916 Limit Control 318172-701 When the York furnace flameThe Lochinvar & A. O. Smith 100109916 Dual Limit Control is a critical safety component designed for heavy duty commercial and residential heating systems. This OEM water heater part serves as a high precision manual reset limit switch, engineered to prevent hazardous overheating by interrupting the burner circuit when temperatures exceed the safe operational threshold. As a direct 100109916 replacement for legacy models 11B79 3, 9004529005, and