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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM thermal safety control for the Amana/Goodman AMVC960403BNAA gas furnace. This normally-closed bimetal switch opens on an over-temperature condition — typically caused by restricted airflow, a dirty filter, or blower failure — cutting power to the gas valve to prevent heat-exchanger damage and rollout.
OEM vs. Generic: Limit switches are calibrated to a precise trip point. The color-coded OEM 0130F00038 guarantees the correct temperature rating for this cabinet. Generic switches with the wrong setpoint cause nuisance trips (heat cutting out early) or, worse, fail to protect the heat exchanger. Always match the OEM color.
Install Difficulty: Easy (1/5). Disconnect power, pull the two spade connectors, remove two mounting screws, and install the replacement in the same orientation. Roughly 10 minutes.