The Robertshaw 780-845 Intermittent Pilot Lockout Ignition Module (SP845) is a dependable ignition control designed for gas-fired furnaces, boilers, and heaters. It functions by managing the ignition sequence, including pilot ignition, flame sensing, and burner operation, ensuring safe and efficient system performance. https://www.partshnc.com/780-845-robertshaw-ignition-module-sp845