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The Goodman 20165703S Hot Surface Ignitor is a genuine OEM replacement igniter for the WFM18070S4BXCB furnace and compatible Goodman and Amana gas furnaces. The hot surface ignitor (HSI) heats to a glowing temperature on each call for heat, lighting the main burners without a standing pilot. A cracked, worn, or no-glow ignitor is one of the most common causes of a furnace that will not fire.
This OEM ignitor is built to the correct resistance and physical mounting spec for your furnace, ensuring proper glow temperature, reliable ignition sequencing, and full compatibility with the furnace control board. Installing the exact factory-matched part avoids the short cycling, delayed ignition, and premature failures often seen with mismatched universal kits.
The genuine OEM ignitor matches the exact element type and connector for a true plug-and-play fit. Universal generic ignitors require adapter harnesses and bracket modification and may run at the wrong glow temperature, shortening service life. For dependable cold-weather startups, OEM is the safer choice.
Moderate. Cut power, remove the burner-compartment panel, unplug the old ignitor, and unscrew it from its bracket — handle the new element by the ceramic base only, never the fragile silicon-nitride tip. Reconnect and mount. A 15–30 minute job best completed by a licensed HVAC technician.