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The B1370154 is a genuine OEM flame rollout limit switch for Goodman and Amana GSMS060-3 gas furnaces. Mounted near the burner assembly, it opens the ignition circuit at 350°F if flames roll out of the burner box — a sign of a blocked flue, cracked heat exchanger, or inadequate combustion air. This is a manual-reset combustion safety device that prevents fire and CO hazards.
The OEM B1370154 is set to the precise 350°F trip point and terminal spacing Goodman designed for this burner. Generic switches with a different setpoint can either nuisance-trip or, worse, fail to protect at the correct temperature. For any safety limit, choose OEM.
Unplug the two spade terminals, remove the mounting screw, and install the replacement. About 10–15 minutes. Turn off gas and power before servicing. If the old switch was tripping, diagnose the root cause (venting, heat exchanger) before returning the furnace to service.