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The Goodman 20162903 Primary Limit Switch is a genuine OEM safety control designed for the WFD195090S5DAA gas furnace and compatible Goodman/Amana models. This normally-closed, snap-disc high-limit switch opens the circuit and shuts down the burners if the heat exchanger reaches an unsafe temperature, protecting your furnace from overheating and preventing damage to internal components.
This is a factory-original Goodman part, calibrated to the exact trip point specified by the manufacturer. Unlike universal or generic limit switches that may require modification or trip at incorrect temperatures, this OEM switch is a direct drop-in replacement that maintains your furnace's safety certification and warranty compliance.
Easy (1 of 5). Replacement typically requires removing two mounting screws and disconnecting two spade terminals. Always disconnect power before servicing. If you are unsure why the original switch failed, have a licensed HVAC technician inspect for underlying airflow or heat-exchanger issues.