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The Goodman 20162903 primary high-limit switch is a genuine OEM safety control for the WGFD293070V4CAA gas furnace. Rated to open at approximately 150°F, this switch continuously monitors heat-exchanger temperature and shuts off the burners if the furnace overheats — protecting the heat exchanger and preventing unsafe operation. A failed limit switch is a common cause of short-cycling, no-heat conditions, or a furnace that runs the blower continuously.
Limit switches must trip at an exact temperature to protect the specific heat exchanger. A generic switch with the wrong setpoint can allow dangerous overheating or cause nuisance trips. The OEM 20162903 is calibrated to Goodman's factory 150°F spec for reliable, safe protection.
Moderate (2/5). Requires removing two mounting screws and transferring the wire terminals. Cut power at the breaker before servicing and confirm correct orientation. Straightforward for a handy DIYer; consult a technician if unsure.