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The B1370145 is a genuine OEM flame rollout limit switch rated at 300°F, designed for Goodman gas furnaces including the GDS80453ANA. Mounted near the burner assembly, this manual-reset safety device instantly cuts power to the gas valve if flame rolls out of the burner box — a critical protection against blocked heat exchangers, poor combustion airflow, or a cracked heat exchanger. When this switch trips, it signals a real combustion problem that should be inspected before reset.
The genuine Goodman OEM switch is calibrated to the exact 300°F trip point and bracket geometry the furnace was engineered around. Because this is a life-safety component, using a generic switch with a different set point or mounting can defeat the protection it provides. OEM guarantees correct calibration and fit.
Easy (2/5). Disconnect power and gas, remove the two mounting screws, transfer the spade terminals, and reinstall. Inspect for the root cause of any rollout trip before returning to service. Always shut off power and gas first.