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The Goodman 20162903 is a primary high-limit safety switch rated at 150°F for GKS90703BXAA gas furnaces. Mounted on the heat exchanger or blower housing, it monitors supply-air temperature and shuts off the gas valve if the furnace overheats — a critical safety device that prevents heat-exchanger damage and fire hazards. A failed limit switch causes short cycling, no-heat conditions, or a furnace that won't fire at all.
The genuine Goodman limit switch is calibrated to the exact 150°F trip point this furnace requires. A generic switch with a different setpoint can nuisance-trip or, worse, fail to trip during a real overheat. For a life-safety component, always choose the OEM part.
Easy to Moderate — typically two mounting screws and two spade terminals. Cut power first and confirm correct orientation. A confident DIYer can handle it, but verify the source of any overheating before returning the furnace to service.