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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM safety control for AMEC800403ANAB furnaces and compatible Goodman/Amana models. The auxiliary limit provides secondary overheat/rollout protection, opening the control circuit to shut down the burners if temperatures in its monitored zone exceed the safe threshold. It backs up the primary limit and helps guard against heat-exchanger damage and flame rollout.
The light-blue color code corresponds to a specific factory trip temperature. Installing a switch with a different rating (a different color) defeats the safety design — it may nuisance-trip or fail to protect. Always match the OEM part number and color; OEM is the correct choice here.
Easy — typically two mounting screws and spade terminals. De-energize the furnace at the breaker, note the wiring, and install the exact replacement. If the auxiliary limit trips repeatedly, check for restricted airflow or a venting issue rather than simply resetting it.