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The genuine OEM Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a factory safety control designed for the Goodman ACSH960905DXAA gas furnace and related 90%+ AFUE models. This auxiliary limit monitors temperature at a secondary location in the heat exchanger or blower compartment and opens the control circuit if it detects an overheat condition, protecting the furnace from damage and preventing unsafe operation.
This is the genuine Goodman OEM part — built to the exact trip temperature and electrical rating the furnace was engineered for, ensuring proper safety response. Generic limit switches may differ in trip point, terminal style, or mounting and can cause nuisance lockouts or fail to protect the appliance. For a critical safety control, OEM is strongly recommended.
Easy (1/5). Disconnect power, unplug the two spade terminals, remove the mounting screws, swap in the new switch, and reconnect. A multimeter to confirm continuity is helpful. Always confirm the model number on your furnace rating plate before ordering.