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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM high-temperature safety switch for the Amana AMH80804BXAA furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens the control circuit if temperatures in its monitored zone exceed the safe threshold, shutting the furnace down to prevent overheating and heat-exchanger damage. A tripped or failed auxiliary limit is a frequent cause of intermittent no-heat lockouts.
Limit switches are safety devices calibrated to a specific trip temperature — the light-blue color code identifies that exact set point. Using the OEM 0130F00038 guarantees the correct temperature rating; a mismatched generic switch can trip too early (nuisance shutdowns) or too late (a genuine safety hazard). Always match by color code and part number.
Easy — Around 10 minutes. Cut power to the furnace, note the wire positions, remove the two mounting screws, transfer the spade connectors, and mount the new switch. Confirm the replacement's color code matches the original before installing.