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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM safety control for the Amana/Goodman AMS80805CXAA 80% AFUE gas furnace. This normally-closed thermal switch opens the control circuit if it detects abnormal heat in its mounting location, shutting the furnace down to prevent overheating. The light-blue color code identifies its specific trip temperature — using the correct color is essential for safe operation.
Because a limit switch is a life-safety device, we strongly recommend the OEM 0130F00038. The factory part is calibrated to the exact trip and reset temperatures the furnace was engineered for. Generic substitutes with the wrong temperature rating can allow dangerous overheating or cause nuisance shutdowns — matching the light-blue code is not optional.
Easy (1/5). Disconnect power, remove two mounting screws, transfer the two wire leads to the new switch, and reinstall in the same orientation. Verify the replacement matches the light-blue color code before installing. Always confirm power is off at the breaker.