Lochinvar & A.O. Smith 100208478 Board

The Lochinvar & A.O. Smith 100208478 Board is a critical OEM replacement control board engineered for high-performance commercial and residential hydronic systems. As a veteran-grade HVACR ignition control, this integrated furnace control (IFC) manages essential sequence operations including hot surface ignition (HSI), flame rectification, and blower timing. Designed for seamless integration with Lochinvar Knight and A.O. Smith water heater models, this printed circuit board (PCB) ensures reliable thermostat communication and safety limit monitoring. This genuine OEM part features ruggedized circuitry to withstand the thermal stress of continuous boiler operation, maintaining precise voltage regulation across the gas valve and inducer motor circuits. For contractors troubleshooting erratic cycling or error code lockouts, installing this 100208478 control module restores system logic and peak combustion efficiency without the compatibility risks associated with universal aftermarket alternatives.

• OEM Compatibility: Specifically calibrated for Lochinvar and A.O. Smith systems, ensuring a direct plug-and-play installation.
• Advanced Diagnostics: Features onboard LED indicators to streamline HVAC troubleshooting and identify fault codes quickly.
• Enhanced Safety: Continuously monitors flue sensor resistance and flame signal to prevent hazardous operating conditions.
• Durability: Built with high-grade components to resist moisture and vibration-induced failures common in boiler rooms.

What are the signs of a failing 100208478 board?
Technicians typically observe intermittent ignition failures, short cycling, or the unit failing to respond to a call for heat despite verified input power. If the status LED shows a specific lockout code related to internal communication or relay failure, the board requires replacement.

Can I use this board for multiple A.O. Smith models?
Yes, this control board is cross-functional across several Lochinvard and A.O. Smith commercial water heaters and boilers. Always verify your specific model and serial number against the manufacturer’s technical manual before installation.

Does this board control the blower motor?
Yes, the 100208478 manages the pre-purge and post-purge timing for the combustion blower, ensuring all exhaust gases are cleared before and after the heating cycle.

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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.