The Lochinvar & A.O. Smith 100093847 Ignition Control Relay is a genuine replacement electrical component designed to manage the ignition sequence in compatible gas-fired boilers, water heaters, and commercial heating equipment. It works by controlling electrical signals between the ignition system and burner components, ensuring safe and reliable burner startup and operation. https://www.partshnc.com/100093847-lochinvar-ao-smith-ignition-control-relay