the Lennox 25G43 is technically identical to the 25G4301 and can be used as a direct 1:1 replacement in all Lennox furnace and AC systems

Rugged Construction: Durable cast iron valve body and die-cast aluminum spring case offer robust protection against environmental demands

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

Common Questions Can I use a 1075 RPM motor to replace an 825 RPM motor

Lochinvar & A.O. Smith 100109944 Ignition Board R-22 the Lennox 25G43 is technicallyThe 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