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The Goodman 0130F00038 is the OEM auxiliary limit switch — identified by its light blue housing to distinguish its trip temperature from other limits in the cabinet — for the Amana AMES920803BNAA gas furnace. This normally-closed thermal safety senses heat in a secondary location (typically the blower deck or heat-exchanger area) and cuts the ignition circuit if temperatures climb past the safe threshold, backing up the primary limit. It's a low-cost but critical part of the furnace's layered safety system.
Color coding matters here: the genuine OEM 0130F00038 guarantees the correct trip point that matches the light-blue original. Grabbing a generic limit with the wrong setpoint is a frequent installer mistake that leads to nuisance trips or reduced protection. We strongly recommend OEM for this safety switch; a verified generic is offered for pros who confirm the temperature rating.
Easy — DIY-friendly (15 min). Cut power to the furnace, note the wire positions, remove the two mounting screws and spade terminals, and install the replacement in the same orientation. Confirm continuity with a meter at room temperature before restoring power.