Lochinvar & A.O. Smith 100167821 Board R-407C this non-Teflon grounding probe provides

this non-Teflon grounding probe provides the essential conductive path required for conductance-type level sensors

Using these orifices in lower BTU units will cause over-firing and potential heat exchanger damage

You can adjust the high and low indicators independently to your required WC settings before replacing the cover

providing critical draft induction for efficient furnace combustion cycles

Lochinvar & A.O. Smith 100167821 Board R-407C this non-Teflon grounding probe providesThe Lochinvar & A. O. Smith 100167821 Integrated Control Board is a critical OEM component designed for high efficiency gas fired boilers and water heaters. As a direct replacement furnace circuit board, this module manages essential system sequences, including hot surface ignition, flame rectification, and manifold gas valve actuation. It serves as the central processing hub, utilizing real time sensor data to modulate thermal output and optimize