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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F high-temperature safety control for the AMH950703BXAD gas furnace and compatible Goodman/Amana models. Mounted on the heat exchanger/blower housing, this normally-closed switch monitors supply-air temperature and shuts off the gas valve if the furnace overheats — a critical protection against heat-exchanger damage and fire.
A failed or nuisance-tripping limit switch causes short cycling, no-heat conditions, or a furnace that runs the blower continuously. Replacing it with the correct 150°F OEM switch restores proper safety operation.
The OEM limit switch is calibrated to this furnace's exact 150°F trip point and mounting footprint. Generic switches with incorrect temperature ratings compromise the safety circuit. For safety controls, OEM is strongly recommended.
Easy to Moderate — disconnect power, unplug two spade terminals, and swap the switch (typically two screws). A multimeter check confirms continuity after replacement.