This kit is the primary service solution for FA4A

it maintains factory-specified tolerances for manifold alignment and orifice positioning

Misalignment can cause flame rollout or improper heating of the flame sensor

this component ensures maximum CFM output while maintaining structural integrity during high-duty cycles

Optimized Flame Detection: Maintains the necessary microamp signal to prevent premature DSI control module lockouts

Lochinvar & A.O. Smith 100208514 Relay Els PW 17895 This kit is the primaryThe Lochinvar & A. O. Smith 100208514 Relay is a critical 24V electromagnetic control designed for precise low voltage circuit switching in commercial and residential hydronic systems. As the direct replacement for RLY2903, this OEM component ensures seamless HVACR system compatibility when interfacing between thermostat controllers and high load mechanical parts. This 24VAC relay is frequently utilized in boiler control boards and water heater wiring