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The B1370145 is a genuine Goodman 300°F flame-rollout limit switch for the ADS80904BXA gas furnace and compatible Goodman/Amana models. Mounted on the burner box, this safety switch detects flame rollout — flames escaping the heat exchanger — and instantly cuts the gas valve to prevent a fire or heat-exchanger damage. A tripped or failed rollout switch is a common no-heat symptom and must never be bypassed.
As a safety-critical OEM Goodman component, the B1370145 is calibrated to trip at the exact 300°F threshold Goodman specified. Off-brand switches may have different trip points or terminal styles. For any rollout safety device, OEM replacement is strongly recommended.
Easy — shut off power and gas, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. If the switch tripped, always diagnose the root cause (blocked flue, dirty burners, cracked heat exchanger) before returning the furnace to service.