Lochinvar & A.O. Smith 100109944 Ignition Board

The Lochinvar & A.O. Smith 100109944 Ignition Board is a critical OEM replacement part engineered for high-performance commercial gas water heaters. Designed for precision ignition control, this integrated circuit manages the HSI (Hot Surface Ignition) sequence, ensuring consistent flame sensing and gas valve timing for specific BTN and BTR 500 series units. As a verified factory replacement board, it eliminates the timing issues and terminal mismatches often found with universal controls, maintaining the original engineering specifications of your Lochinvar or A.O. Smith boiler or water heater. This ignition module is built to handle the rigorous duty cycles of industrial environments, providing the exact smart touch interface compatibility needed for 120V system integration and reliable burner control.

• Direct OEM Compatibility: Specifically designed for A.O. Smith BTN 120/180 and BTR 500 series models to ensure a perfect fit without modification.
• Enhanced Firing Sequence: Maintains precise control over the hot surface igniter and blower motor for optimized combustion efficiency.
• Superior Reliability: Industrial-grade components resistant to thermal stress, reducing boiler ignition failure and intermittent operation.
• Flame Sensing Accuracy: Features refined micro-amp flame rectification to prevent nuisance lockouts and erratic system behavior.

• Will this board work for non-500 series BTR units? No, this integrated control board is engineered specifically for the BTR 500 series and BTN models. Always verify your serial number to ensure part number 100109944 is the correct match for your chassis.
• Does this board include the replacement fuse? Yes, the 100109944 ignition board typically features an on-board fuse to protect the circuit from low voltage shorts during installation.
• Can I use this for a liquid propane (LP) unit? This ignition control board manages the electrical sequence and is compatible with both natural gas and LP configurations, provided the unit’s gas valve and orifices are correctly set.

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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.