the ignition sequence will lock out

Key Benefits Full Component Restoration: Includes the enclosing tube

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

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

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

Lochinvar & A.O. Smith 100109944 Ignition Board R-22 the ignition sequence will lockThe 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