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The Goodman B1370145 is a genuine OEM 300°F flame-rollout limit switch for the AMH80453ANAA furnace. Mounted on the burner box, this manual-reset safety opens the ignition circuit if flames roll out of the burner compartment — typically from a blocked heat exchanger or restricted venting. When tripped, it shuts the furnace down to prevent overheating and unsafe operation, making it a critical safety component.
The OEM B1370145 is calibrated to trip at exactly 300°F with the correct terminal orientation and mounting bracket for the burner box. Generic switches with the wrong trip point or reset type can nuisance-trip or, worse, fail to open when needed. On a safety device, always use the OEM-rated part.
Easy — Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. About 15 minutes. If the old switch had tripped, diagnose and correct the root cause (venting/heat exchanger) before returning the furnace to service.