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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety control designed as a direct-fit replacement for the VMES800403AXAA gas furnace and compatible Goodman/Amana models. This normally-closed thermal limit continuously monitors furnace heat-exchanger and cabinet temperatures, opening the control circuit to shut down the burners if a rollout or overheat condition is detected. A failed or nuisance-tripping auxiliary limit is a common cause of no-heat calls and intermittent lockouts.
This is a genuine OEM Goodman switch, calibrated to the exact trip temperature specified by the manufacturer for the VMES800403AXAA. Generic universal limits are cheaper but often carry a different setpoint or spade orientation, which can lead to premature tripping or a failure to protect the heat exchanger. For a safety-critical component, OEM is strongly recommended.
Easy (1/5). Replacement is a quick job for most technicians: disconnect power, unplug the two spade terminals, remove the mounting screws, install the new switch in the same location and orientation, then reconnect. Always verify the correct color/temperature rating before installing. If you are not comfortable working around gas-fired equipment, contact a licensed HVAC professional.