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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is a genuine OEM thermal safety control for the Amana/Goodman AMH80804BXBC gas furnace. This secondary limit protects a specific zone — typically the blower deck or supply plenum — by opening the control circuit if temperature exceeds its rated set point, guarding against overheating when the primary limit or airflow path is compromised.
The light-blue color code identifies this switch's exact trip temperature. Installing a switch with a different rating — easy to do with unmarked generics — either defeats the protection or causes false trips. Always match the OEM part and color code for correct, safe operation.
Easy — mounts with two screws and connects via quick-disconnect terminals. De-energize the furnace before servicing, verify the color code matches the original, and confirm normal heat cycles after replacement.