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The 0130F00038 (identified by its light-blue body) is a genuine OEM auxiliary high-limit switch for the Goodman/Amana AMEC961004CNAD gas furnace. This normally-closed thermal safety opens the control circuit if temperatures in the blower or burner area exceed the rated trip point — protecting the heat exchanger and cabinet from overheating caused by restricted airflow, a dirty filter, or blower failure.
The color-coded body denotes a specific trip temperature. Installing a generic switch with the wrong setpoint can either nuisance-trip in normal operation or fail to protect against a real overheat condition. This OEM part guarantees the correct rating and terminal spacing for the AMEC961004CNAD.
Two mounting screws and two spade terminals. De-energize the furnace, note wire positions, swap the switch, and reconnect. Roughly a 15-minute repair for a homeowner comfortable working inside the furnace cabinet.