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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the Goodman ADSS800603AXAD gas furnace and compatible ADSS8-series models. The auxiliary limit provides an additional layer of overheat protection beyond the primary high limit, monitoring a secondary location within the furnace cabinet and opening the control circuit if temperatures exceed safe levels. Goodman's light-blue color code identifies this switch's specific trip-temperature rating.
As a safety device, the auxiliary limit must trip at the exact temperature the furnace was designed for. The OEM 0130F00038 is factory-calibrated and color-coded for this role. Generic replacements with mismatched trip points can defeat the furnace's layered overheat protection. Always verify by OEM part number and color code before installing.
Easy — Two-screw mount with spade-terminal wiring. Disconnect power first. Persistent tripping usually points to an airflow or blower problem rather than a faulty switch.