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The Goodman B1370145 is a genuine OEM flame rollout limit switch rated to open at 300°F, built as a direct-fit replacement for the GMNT140-5B gas furnace and compatible Goodman/Amana models. Mounted on the burner box, this manual-reset safety switch detects flame roll-out — flames escaping the heat-exchanger inlets — and immediately shuts down the furnace to prevent overheating and fire hazards.
A tripped rollout switch usually signals an underlying problem such as a blocked flue, cracked heat exchanger, dirty burners, or a failing inducer. Replace a switch that has failed open or lost its calibration, and always diagnose the root cause before returning the furnace to service.
The OEM B1370145 is calibrated to the precise 300°F trip point and bracket geometry your furnace's safety certification depends on. Generic switches with a different set point or reset style can trip late (unsafe) or nuisance-trip (no heat). For a life-safety limit, always install the exact OEM specification.
Easy (1 of 5). Typically under 15 minutes. Cut power at the disconnect, note the two wire positions, unscrew the switch from the burner bracket, transfer the leads, and mount the new switch. Because this is a safety device, confirm the underlying cause of any trip — when in doubt, use a licensed HVAC technician.