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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue body) is a genuine OEM safety control for the Amana/Goodman AMH80603AXAA gas furnace. This thermally activated switch monitors temperature at the heat exchanger or blower area and cuts power to the gas valve if it detects an overheat or flame-rollout condition, protecting your furnace and home from unsafe operation.
Limit switches are calibrated to a specific trip temperature — the light-blue color code marks that exact set point. Installing the correct OEM switch is critical: a substitute with the wrong temperature rating can either nuisance-trip or, worse, fail to protect the equipment. Always match the OEM part number and color.
Easy (1 of 5). A quick 10-minute job. Disconnect furnace power, remove the access panel, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Never bypass or jumper a limit switch.