Easy Installation: Standard 2-wire spade terminal connection for immediate field replacement

the ignition sequence will lock out

breaking the circuit and terminating the heating cycle until the reset button is engaged

It will not open if the inlet and outlet pressures are equalized or if the system pressure is below this threshold

Enhanced Reliability: Features internal pressure relief and thermal overload protection to prevent motor burnout

Lochinvar & A.O. Smith 100109944 Ignition Board R-22 Easy Installation: Standard 2-wire spadeThe 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