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The Goodman 0130F00038 auxiliary limit switch is a genuine OEM safety control for the ACES801005CXAA furnace and related Goodman/Amana units. Identified by its light-blue body, this normally-closed thermal switch monitors temperature at a secondary location in the cabinet and opens the circuit if it detects an overheat condition, shutting down the burner to prevent heat-exchanger damage and fire hazards.
Limit switches are factory-calibrated to a specific trip temperature — the color coding indicates that setpoint. Installing a generic switch with the wrong trip point can either nuisance-trip or, worse, fail to protect the furnace. This OEM Goodman part guarantees the exact temperature rating the unit was designed around. Do not substitute by appearance alone.
Easy (1/5). Two mounting screws and two spade terminals. A 10-minute repair for most DIYers. Disconnect power before replacing and never bypass a limit switch.