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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch, identified by its light blue temperature-code marking, for the ADSS800804BXAC gas furnace and compatible Goodman/Amana models. This normally-closed safety limit provides secondary over-temperature protection — commonly guarding against flame rollout or excessive heat at the blower/vestibule area — and opens the control circuit to shut down the burners when its trip point is reached. The light-blue code sets the specific temperature threshold this furnace requires.
Auxiliary limits are matched to a precise trip temperature indicated by their color code. Substituting a different-code or generic switch can defeat the furnace's rollout protection or cause repeated nuisance trips. Always replace with the exact light-blue OEM limit.
Easy — Disconnect power, remove the two wire terminals and mounting screws, and install the matching replacement. Verify the light-blue code matches the original before wiring; a licensed technician is recommended if rollout was the cause of failure.