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The Goodman 0130F00038 is a color-coded light blue auxiliary limit switch for the Goodman/Amana ACES800403AXAA and compatible gas furnaces. Mounted near the blower or in the supply air path, this normally-closed thermal control provides a secondary layer of overheat protection, cutting power to the gas valve if temperatures in its zone exceed the safe range. The light-blue color identifies its specific factory trip temperature.
This genuine OEM Goodman auxiliary switch is set to the precise trip temperature your furnace's design requires, shown by the light-blue housing. Substituting a generic or wrong-color limit risks either nuisance trips or, worse, failure to shut down during a genuine overheat. Match the OEM part and color exactly.
Easy — Cut power, remove the mounting screws, transfer the wiring, and secure the new switch. Quick to replace, but always diagnose the root cause of any overheat (airflow, blower, filter) before restoring operation. Plan 15–20 minutes.