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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F safety control designed for the ACV90704CXBB gas furnace and compatible Goodman/Amana units. This switch monitors heat-exchanger temperature and shuts off the burners if the furnace overheats, protecting your equipment and home. A failed limit switch is a common cause of short cycling, no-heat conditions, or a furnace that locks out on a flashing fault code.
As a genuine OEM safety component, this limit switch is calibrated to the exact 150°F trip point your furnace's controls expect. Generic switches with mismatched temperature ratings can trip early (nuisance shutdowns) or late (unsafe overheating). For a safety control, always choose OEM.
Easy–Moderate (2/5). Power off the furnace, disconnect the two leads, remove two mounting screws, and swap. Most installs take 15–25 minutes. Label wires before removal.