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The Goodman 20162904 is the primary high-limit temperature control for the ACEC960803BNAA gas furnace. This safety switch continuously monitors heat-exchanger and plenum temperature and shuts off the gas valve if the furnace overheats — protecting against blocked airflow, dirty filters, or blower failure. When a furnace heats briefly then shuts down (limit trip), an open or failed primary limit is a common cause.
The genuine 20162904 is calibrated to this furnace's exact cutout temperature and mounting footprint. Generic limits with mismatched trip points either nuisance-trip during normal operation or fail to protect the heat exchanger. OEM ensures correct calibration and a direct bolt-in fit.
Easy–Moderate (2/5). Disconnect power, unplug the two spade terminals, remove the mounting screws, and reverse for the new control. Confirm filter and blower airflow are clear so the new limit isn't tripped by an underlying restriction.