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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F high-limit safety control for Amana AMES960804CNAA 96% AFUE gas furnaces. Mounted on the heat exchanger/blower deck, this auto-reset thermal switch monitors supply-air temperature and cuts power to the burners if the furnace overheats — typically from restricted airflow, a dirty filter, or a failing blower — then automatically closes again once temperatures return to normal.
The 150°F trip point is matched to the AMES960804 heat-exchanger design. Using the factory Goodman switch guarantees the furnace trips at the correct temperature for proper overheat protection. Generic limits with a different set point cause nuisance shutdowns or allow dangerous over-temperature operation. For any safety limit, insist on OEM.
Moderate (2/5). Power down the furnace, remove the two mounting screws, transfer the two spade wires to the new switch, and remount. Straightforward for a handy DIYer, but a qualified HVAC technician is recommended. If the old limit was tripping, correct the underlying airflow problem before returning the furnace to service.