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This genuine OEM Goodman 0130F00038 is the light-blue-coded auxiliary limit switch for the Goodman/Amana ADVC80603BXBB furnace and compatible models. The auxiliary (secondary) limit provides an additional layer of over-temperature protection beyond the main high limit, typically guarding the blower compartment or a secondary section of the heat exchanger. When temperatures exceed its rated setpoint, it opens the control circuit and shuts down heating to protect the furnace and home.
Like the primary limit, this switch is matched to a specific trip temperature indicated by its light-blue color code. Because it is a life-safety component, using the exact OEM 0130F00038 ensures the correct calibration and bracket fit. Never mix up the pink (0130F00036) and light-blue (0130F00038) limits — they protect different zones at different setpoints.
Easy (1/5). Kill power to the furnace, unscrew the switch, move the spade terminals to the new part, and remount. Roughly 10 minutes. If the switch keeps tripping, diagnose the underlying airflow or blower problem first.