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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch — identified by its light-blue body — for AMES921004CNAA gas furnaces and compatible Goodman/Amana models. This secondary thermal safety control provides overheat protection at a specific zone of the furnace (blower or heat-exchanger area). If temperatures exceed its rated trip point, it opens the control circuit to prevent damage. A tripped or open auxiliary limit is a frequent reason a furnace won't fire or repeatedly shuts down mid-cycle.
Because the light-blue color code corresponds to a precise trip temperature, the OEM 0130F00038 is strongly recommended to ensure the correct safety threshold. Generic substitutes must match both the trip point and the color code exactly — verify carefully before choosing an equivalent.
Easy (2/5) — Disconnect power, remove the two terminals and mounting screws, and install the matching light-blue replacement. Roughly 10–15 minutes.