Lochinvar & A.O. Smith 100167865 Board

When you're out in the field servicing high-performance Shield water heaters, the Lochinvar & A.O. Smith 100167865 Board is the backbone of the system's logic and safety. Formerly known by part number RLY30112, this integrated control board is a genuine OEM replacement part engineered specifically for the Shield SNR126, SNR151, and SNR201 models. As an HVAC technology professional, you know that keeping these units running at peak thermal efficiency requires precise modulation and reliable communication between the sensors and the ignition control board.

This integrated control board manages critical combustion sequences, including the blower pre-purge, spark electrode timing, and flame sensor feedback. It is designed to handle commercial-grade demands, fitting both Lochinvar and A.O. Smith applications where advanced diagnostics are required to troubleshoot common boiler error codes. By replacing a failing module with this direct OEM water heater part, you restore the system's ability to modulate the firing rate effectively, ensuring stable temperature control and meeting the rigorous safety standards of high-output commercial water heaters.

Key Benefits:

• Precise System Compatibility: Specifically programmed for Shield series SNR126, SNR151, and SNR201 water heaters.
• Advanced Diagnostics: Features on-board LED indicators to quickly identify HVAC troubleshooting codes, reducing downtime during service calls.
• Reliable Igniter Control: Direct oversight of the 24V gas valve and 120V inducer blower for consistent ignition cycles.
• OEM Durability: Built to withstand the high-cycle thermal demands of commercial residential heating systems.
• Safety Logic: Monitors low water cutoff (LWCO), pressure switches, and flame rectification protocols simultaneously.

Common Questions:

• What does a 'Flame Fail Ign' error mean on this board? Usually, this indicates the board failed to detect a flame after three ignition trials; check the flame rod and supply polarity before replacing the board.
• Is this board a direct replacement for the old RLY30112? Yes, the 100167865 is the current manufacturer-approved update for that legacy part number.
• Does this module control the combustion blower modulation? Yes, it regulates the blower speed based on the temperature setpoint and internal sensor feedback to maintain high efficiency.

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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.