Lochinvar & A.O. Smith 100208493 Board 320734-701 utilizing a balanced port construction

utilizing a balanced port construction to prevent hunting and ensure stable evaporator performance

the element is likely cracked or degraded and requires replacement

Designed for the rigors of commercial and high-demand residential applications

How do I troubleshoot a failure to ramp up

it is compatible with an optional OS-100 kit if a physical outdoor reset is preferred

Lochinvar & A.O. Smith 100208493 Board 320734-701 utilizing a balanced port constructionThe Lochinvar & A. O. Smith 100208493 Pump Relay Board is a critical OEM replacement component designed for high demand hydronic heating applications. Rated for 1. 5 HP pump motor control, this board serves as the primary switching interface between the boiler's integrated control logic and the external circulation pumps. It is specifically engineered for compatibility with Lochinvar Knight XL KB399 800 and FTXL series boilers, as well as several A.