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The 20165703S is a genuine Goodman OEM hot surface ignitor (HSI), a direct-fit replacement for the WFM18090S5CXCC and compatible Goodman/Amana gas furnaces. On each call for heat the control board energizes the ignitor, which glows red-hot to light the burners. Hot surface ignitors are one of the highest-wear parts in a furnace: the element becomes brittle with thermal cycling and eventually cracks, producing a furnace that runs the inducer and clicks but never lights. If your furnace is not igniting, the ignitor is the first component to inspect.
OEM silicon-nitride ignitors deliver the correct resistance and warm-up time the Goodman control board expects, and are far more durable than legacy silicon-carbide universals. Generic drop-in kits with adapter harnesses can work but often have shorter service life and mismatched glow timing. For the longest-lasting repair, choose the genuine OEM ignitor.
One or two mounting screws and a single plug connector. The element is fragile — handle only by the ceramic base, never the glow area. Shut off power and gas before servicing. Most installs take 15–20 minutes.