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The B1370145 is a genuine OEM 300°F flame rollout limit switch for the Goodman/Amana AMH80453ANAB furnace. This critical safety device is mounted near the burner assembly and instantly shuts off the gas valve if flames roll out of the combustion chamber — a symptom of blocked heat exchangers or restricted venting. A tripped or failed rollout switch will prevent the furnace from firing until the fault is cleared and the switch is reset or replaced.
Because this is a life-safety component, we strongly recommend the OEM switch. It is calibrated to the exact 300°F trip point and bracket geometry Goodman specified for this model. Generic switches may differ in trip temperature or mounting, compromising protection.
Easy — a two-wire swap secured by one or two screws, typically 10–15 minutes. Disconnect power and shut off gas first. If the switch keeps tripping, diagnose the underlying cause before returning the furnace to service.