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The Goodman 0130F00038 Auxiliary Limit Switch is the genuine OEM temperature-limit safety control for the Amana/Goodman AMVC80805DNCA gas furnace. This normally-closed thermal switch opens the control circuit and shuts the furnace down if it senses an over-temperature condition — for example from a blocked filter, failed blower, or restricted airflow — protecting the heat exchanger and cabinet from overheating.
Limit switches are calibrated to a specific trip temperature — Goodman color-codes them (this one is light blue) precisely so the correct cutout point is installed. Installing a generic switch with the wrong trip temperature can either cause nuisance shutdowns or, worse, fail to protect the furnace. Always match the OEM part and its color code exactly. OEM is required for safe operation.
Easy. Typically two mounting screws and two spade terminals. Power down the furnace first, note the wire positions, and confirm the replacement's color code matches the original. If the old switch tripped, diagnose and correct the underlying airflow or blower fault before returning the furnace to service.