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The Goodman B1370198 is a genuine OEM primary high-limit switch rated at 150°F for the AMV80704BXBA gas furnace. Mounted on the heat-exchanger/blower partition, it monitors supply-air temperature and opens the control circuit to shut off the burners if the furnace overheats — protecting the heat exchanger from damage due to low airflow, a dirty filter, or blower failure.
OEM B1370198 switches match the factory 150°F setpoint and mounting bracket exactly. Generic high-limits with different trip temperatures or footprints can cause short-cycling or fail to protect the heat exchanger. For a safety-rated control, choose the correct OEM part.
Easy — DIY friendly. Secured by two screws with spade-terminal wiring. Disconnect power before servicing. If the limit is tripping, first check the filter, blower operation, and ductwork for airflow restrictions before condemning the switch.