Lochinvar & A.O. Smith 100167799 Control Board

As a veteran tech, you know that a glitchy boiler often traces back to the primary logic center. The Lochinvar & A.O. Smith 100167799 Control Board is the definitive OEM replacement part for high-efficiency hydronic systems. This integrated control board is a direct, drop-in successor to the discontinued RLY30043, ensuring 100% circuit board compatibility without requiring harness modifications. Engineered specifically for the Lochinvar Knight series, including KBN211, KB81-286, and WB81-211 (prior to H10) models, this board manages the complex firing sequence, modulating blower speeds, and pump relay timing to maintain peak thermal efficiency. Whether you are dealing with communication errors on the display or inconsistent ignition cycles, swapping in this genuine Lochinvar part restores the precise SMART SYSTEM parameters required for safe, reliable operation. Don't risk a callback by using universal boards; stick with the factory-authorized control designed for these fire-tube heat exchangers.

• Direct OEM Match: Fully replaces the obsolete RLY30043, preserving original factory programming and safety logic.
• Advanced Diagnostics: Interfaces seamlessly with the Knight Boiler display to provide real-time fault codes and operational data.
• Precision Modulation: Manages the 0-10V signal for the combustion blower and coordinates system pump terminal outputs.
• Rugged Build Quality: Built to withstand the high-temperature environments typical of commercial water heating and residential hydronic applications.

Is the 100167799 compatible with older RLY30043 units?
Yes. The 100167799 is the official manufacturer-designated replacement for RLY30043. It features the same pin configurations and mounting points for a seamless swap.

Will this board fix 'No Flame' or 'Ignition Failure' codes?
While this integrated control board manages the ignition trial, technicians should also verify the flame sensor and ignitor. If the board isn't sending voltage to the gas valve, this replacement is usually the solution.

Do I need to re-program the boiler parameters after installation?
The board comes with factory-standard logic, but you should always verify the specific Knight Boiler model settings and outdoor pulse parameters to ensure the system is optimized for the local heating load.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.