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The Goodman B1370154 Flame Rollout Limit Switch is a genuine OEM safety control engineered for the Goodman/Amana GMNT040-3 gas furnace and compatible models. This normally-closed, manual-reset switch monitors the burner box for flame rollout — a dangerous condition where combustion escapes the heat exchanger. When temperatures reach its 350°F trip point, it cuts power to the gas valve to shut the furnace down and protect your equipment and home.
This is a genuine Goodman OEM switch with a factory-calibrated trip point and UL-recognized construction. Generic aftermarket rollout switches are cheaper but may trip early (nuisance shutdowns) or late (a real safety risk). For a flame-safety component we strongly recommend OEM.
Easy — 2 spade connectors and 1–2 mounting screws. Always disconnect power and gas before servicing. If the switch has tripped, diagnose the root cause (blocked flue, cracked heat exchanger, or dirty burners) before resetting.