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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM high-limit safety control for AMS80603AXAC gas furnaces and compatible Goodman/Amana models. It continuously senses supply-air temperature and interrupts the gas valve if the furnace exceeds safe limits, preventing heat-exchanger and blower damage.
As the furnace's primary overheat safeguard, this control must trip at the exact temperature engineered for your model. This OEM Goodman part is factory-calibrated to that setpoint. Generic substitutes with incorrect trip points can permit unsafe overheating or cause repeated short-cycling, so OEM is the recommended choice.
Difficulty: Easy to Moderate — Bolt-on mount with a two-wire connection. Typically replaced in 20–30 minutes with power off. Confirm proper seating against the airflow path so the sensor reads accurately.