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The genuine OEM Goodman 20165703S Hot Surface Ignitor is the exact-fit igniter for the WFM18140S5DNCC gas furnace. The hot surface ignitor (HSI) glows to light the burners on each heat call; it is one of the most common furnace failure points, cracking or burning out over time and leaving you with a furnace that clicks and tries to start but produces no heat. This factory part restores dependable first-attempt ignition.
Universal HSI kits require adapting the bracket and splicing the connector, and their heat-up curve may not match what the WFM18140S5DNCC control board sequences for. The OEM 20165703S includes the correct bracket and plug so it seats in the original position with proper burner alignment and ignition timing — no splicing.
Easy — DIY friendly (2/5). Usually one or two mounting screws and a single plug connector. Shut off power and gas first. Handle the ignitor by the ceramic base only — skin oils and physical contact with the fragile element shorten its life. Confirm a clean glow and burner light-off after install.