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The Goodman B1370145 is a genuine OEM flame rollout limit switch that protects your Goodman ADV80905CXBA gas furnace from dangerous flame rollout conditions. Mounted on the burner box, this manual-reset switch opens the control circuit at 300°F to shut off the gas valve if flames roll out of the burners due to a blocked heat exchanger, restricted flue, or poor combustion airflow. It is a key safety component and a frequent cause of no-heat faults when tripped.
Genuine OEM rollout switches are calibrated to the precise trip point your furnace's safety design requires. Because this is a life-safety device, we strongly recommend the OEM part over generic substitutes that may trip early, late, or fail to reset reliably.
Disconnect power, remove the two wire leads and mounting screws, and install the replacement in the same orientation. If a rollout switch has tripped, always diagnose and correct the underlying cause (heat exchanger, flue, or airflow) before returning the furnace to service.