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The Goodman 20165703S Hot Surface Ignitor (HSI) is a genuine OEM silicon-nitride ignitor built for the Goodman WFM18070S3AXCC furnace and compatible models. On a call for heat, the control board energizes the ignitor until it glows, lighting the burners. A cracked or worn ignitor is the leading cause of no-ignition and no-heat furnace failures.
Silicon-nitride ignitors are more durable and shock-resistant than older silicon-carbide styles, offering longer service life.
OEM Goodman ignitors ship with the correct bracket, connector, and resistance for a plug-and-play fit and reliable ignition timing. Generic universal HSIs require adapter harnesses and may not seat correctly in the burner assembly. OEM guarantees proper positioning and glow characteristics.
Easy to Moderate — one or two screws and a single plug connector. Handle the fragile element by the bracket only — never touch the ceramic. Shut off power and gas before servicing.