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The Goodman B1370154 is a genuine OEM 350°F flame rollout limit switch for the GDT090-4A gas furnace and compatible Goodman/Amana equipment. Mounted near the burner assembly, this manual-reset safety trips and shuts off the furnace if flames roll out of the combustion chamber — a critical protection against a cracked heat exchanger, blocked flue, or restricted combustion air.
A rollout switch is a life-safety component, so the exact OEM trip point and bracket geometry matter. The genuine B1370154 mounts in the factory location and trips at the engineered temperature. Important: a rollout switch that has tripped usually signals an underlying combustion problem — have the furnace inspected before resetting or replacing. OEM is strongly recommended for safety parts.
Easy (2/5) — Cut power, disconnect the two terminals, remove the mounting screws, and install the replacement. Correct positioning at the burner box is essential; professional inspection is advised if the switch tripped.