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The 0130F00038 is a genuine OEM auxiliary limit switch — identified by its light blue housing — for the Amana/Goodman AMEC800603BXAA gas furnace. This secondary over-temperature safety control supplements the primary limit, opening the circuit and shutting down the burners if it senses abnormal heat at its mounting location (such as blocked airflow or a blower fault). It is a key life-safety component that guards against overheating and heat-exchanger stress.
The OEM 0130F00038 is calibrated to the exact factory trip temperature (matched to the light-blue color code) and mounting footprint — the correct choice for a safety device. A generic equivalent may match terminals and disc size at lower cost, but the trip point and color/rating must line up precisely; when in doubt on a safety limit, choose OEM.
Cut power to the furnace, disconnect the spade terminals, remove the mounting screws, and install the new switch in the identical position and orientation. A handy homeowner can complete it, but have the furnace's operation verified afterward. Match the light-blue color code and part number to your unit's rating plate before ordering.