Lochinvar & A.O. Smith 100167823 Integrated Control

The Lochinvar & A.O. Smith 100167823 Integrated Control is a critical OEM replacement part designed for high-efficiency hydronic systems. This main integrated control board serves as the central intelligence for Knight XL (KBN400) heating boilers and compatible A.O. Smith Cyclone Mxi commercial water heaters. Engineers and technicians rely on this digital boiler controller to manage complex ignition sequences, monitor flame rectification, and maintain precise set-point temperature differentials to ensure peak thermal efficiency.

Built for durability in demanding mechanical rooms, the 100167823 handles SMART SYSTEM control logic, regulating burner modulation and domestic hot water (DHW) priority. It is essential for troubleshooting common boiler fault codes like E06 or ignition failures where the existing sequence of operation is compromised. This board replaces legacy part numbers including RLY40032, RLY30065, and 100167946. By integrating the latest firmware for iCOMM connectivity and diagnostic reporting, it simplifies field maintenance and improves system uptime for commercial contractors.

• Precision Modulation: Optimizes fuel-to-air ratios and firing rates for condensing boiler applications.
• Comprehensive Diagnostics: Facilitates rapid identification of HVAC error codes to reduce service call duration.
• Universal Compatibility: Engineered specifically for Lochinvar Knight XL series beginning with serial H10.
• Enhanced Safety: Manages high-limit resets and gas pressure proving switches for secure appliance operation.

Does this board replace the RLY40032 and 100167946?
Yes, the 100167823 is the direct factory-authorized replacement for those discontinued part numbers, ensuring full backward compatibility with existing wiring harnesses.

What is the primary cause of failure on these integrated controls?
Field data suggests that voltage spikes and moisture infiltration in the mechanical room are the most common causes of control board failure. Always verify proper grounding and surge protection during installation.

Is firmware configuration required after installation?
While the board is pre-programmed, technicians must verify the boiler model parameters and setup menus to match the specific BTU input and application requirements of the unit.

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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.