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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM safety switch for the AMEC960804CNAB gas furnace and compatible Goodman/Amana models. Mounted on the heat exchanger/blower deck, this high-limit control continuously monitors supply-air temperature and opens the circuit to shut off the burners if the furnace overheats—protecting the heat exchanger from cracking and preventing a fire hazard when airflow is restricted by a dirty filter or failed blower.
The genuine 20162904 is calibrated to the precise trip temperature this furnace requires. Generic limits may open too early (nuisance shutdowns) or too late (unsafe). Because this is a life-safety component, we recommend the factory OEM part every time.
Difficulty: Easy to Moderate. Cut power at the disconnect, remove the two mounting screws and the wire connectors, and swap in the replacement in the same orientation. A DIY-capable owner can manage it, but have a technician verify operation on startup.