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The Goodman B1370195 is a genuine OEM primary high-limit switch built for the GDS80904BNA gas furnace and related Goodman/Amana 80% AFUE models. Mounted on the heat exchanger vestibule, it continuously monitors supply-air temperature and cuts power to the gas valve if the furnace exceeds a safe operating temperature — protecting the heat exchanger, blower, and ductwork from heat damage.
The genuine B1370195 is factory-matched to the furnace's airflow and heat-exchanger design, so it trips at exactly the right threshold. Generic substitutes with the wrong trip point can cause nuisance shutdowns during normal heating cycles or, worse, fail to trip when needed. For a life-safety component, choose OEM.
Easy (2/5). Disconnect power and gas, remove the two mounting screws, transfer the wire leads, and reinstall. A 10–15 minute job for most DIYers; call a pro if you're unsure or see signs of heat exchanger cracking.