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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F high-limit safety control for the GCH950905DXAB gas furnace. Mounted on the heat exchanger or blower deck, it monitors supply-air temperature and opens the control circuit if the furnace overheats — shutting down the burners to protect the heat exchanger and prevent unsafe operation. A tripped or failed limit switch is a common cause of short-cycling or a furnace that won't fire.
The OEM Goodman switch is calibrated to the exact 150°F trip point and mounting footprint your furnace was engineered for. Generic replacements may use a different temperature rating or bracket, which can cause nuisance trips or fail to protect the heat exchanger. For a safety-critical control, always choose OEM.
Easy (1/5). Disconnect power, unplug the two spade terminals, remove two mounting screws, and reverse for the new switch. A 15-minute repair for most homeowners.