Lochinvar & A.O. Smith 100208488 Relay Board

The Lochinvar & A.O. Smith 100208488 Relay Board is a critical OEM replacement part engineered for high-performance hydronic heating and water heating systems. As the direct replacement for RLY2049, this board facilitates precise communication between the Smart System control module and peripheral components, including pumps, fans, and gas valve relays. Designed for Lochinvar Knight boilers and A.O. Smith commercial units, it ensures accurate execution of the sequence of operation, from initial call for heat to post-purge. This circuit board is essential for resolving common fault codes related to relay failure or intermittent component signaling. By maintaining stable voltage regulation across the low-voltage connection board, it protects the system's heat exchanger and blower assembly from damage caused by improper cycling. Field-tested for optimum compatibility, the 100208488 is the preferred choice for service contractors requiring a reliable HVAC control board that restores factory-spec functionality without extensive field modifications.

• Universal Compatibility: Serves as the definitive OEM replacement for the discontinued RLY2049, ensuring pin-for-pin alignment in Lochinvar and A.O. Smith applications.
• Enhanced System Resilience: Regulates relay ON/OFF cycles for system pumps and louver relays, preventing premature wear on primary heating components.
• Diagnostic Accuracy: Integrates seamlessly with the LCD display and Smart Control module to provide accurate data logs and troubleshooting feedback.
• Energy Efficiency: Optimizes firing rates and pump operation based on real-time sensor data, reducing overall utility consumption.

• How do I confirm if my existing RLY2049 needs to be replaced? Technicians should check for intermittent relay failure or "GV Relay Fail" error codes on the display; if the wiring harness and gas valve bench-test correctly, the board is likely faulty.
• Is this board a "plug-and-play" replacement for older units? Yes, the 100208488 is designed to fit the original mounting footprint and connector headers of the RLY2049.
• Can this relay board resolve blower or pump ignition issues? If the smart system is sending a signal but the 115 VAC components aren't energizing, replacing the relay control board often restores the circuit.

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.