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The Goodman 20162904 is a genuine OEM primary high-limit temperature control designed for the VMS81005CXAA gas furnace and compatible Goodman/Amana models. This safety switch continuously monitors heat-exchanger temperature and shuts off the gas valve if the furnace overheats — protecting against cracked heat exchangers, blocked airflow, and fire hazards. If your furnace short-cycles on the heat call, trips the limit, or fails to fire, a faulty primary limit is a common cause.
This genuine OEM Goodman control is factory-calibrated to the exact trip and reset temperatures specified for this furnace's heat exchanger. Generic limits may carry different setpoints, which can nuisance-trip the unit or, worse, fail to trip when needed. For a life-safety component, OEM is the recommended choice.
Easy to Moderate — disconnect power, remove the two mounting screws and spade connectors, and install the replacement in the same orientation. No calibration needed. Always verify furnace operation and cycle the limit after installation.