Lochinvar & A.O. Smith 100208496 Control Board

The Lochinvar & A.O. Smith 100208496 Control Board is a critical OEM replacement part designed to maintain the operational integrity of high-efficiency commercial boilers and water heaters. As the direct replacement for RLY2107, this relay control board manages executive switching functions, including the 24VAC signal distribution to the ignition module and pressure switch systems. This board is essential for coordinating the two-speed blower motor and pump relay cycles, ensuring the combustion chamber pre-purge and ignition sequences fire within strict timing parameters. Engineered for seamless integration with Smart Touch Con-X-Us interfaces, the 100208496 facilitates accurate communication between sensors and the central boiler control module. For contractors performing field service, this board addresses common failure points such as intermittent relay chatter or lost signals to the blower speed taps. Utilizing genuine Lochinvar parts ensures component-level compatibility and protects the system’s high-fire stage modulation without the risks associated with generic aftermarket alternatives.

• Direct OEM Compatibility: Engineered as the specific RLY2107 replacement for a drop-in fit in Lochinvar and A.O. Smith systems.
• Precise Signal Logic: Ensures accurate relay control for blower speed transitions and pump activation during the call for heat.
• Enhanced Durability: Constructed with high-grade electrical traces to withstand the thermal stress and high-duty cycles of commercial HVACR environments.
• System Synchronization: Optimizes communication between the ignition module and the air pressure switches for reliable prepurge cycles.

What is the difference between RLY2107 and 100208496?
The 100208496 is the current, factory-authorized relay control board that replaces the discontinued RLY2107. It maintains the same form, fit, and electrical specifications for older boiler models.

Will this board resolve blower motor speed issues?
Yes, if the diagnostic trace indicates a failure in the relay's ability to switch between high and low speed taps, installing this replacement control board is the standard corrective action.

How do I verify if this part fits my specific boiler?
This board is common in Power-Fin and other Lochinvar commercial units. Always cross-reference your specific model and serial number against the 100208496 part number in the technical manual before installation.

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.