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The Goodman 0130F00038 is a genuine OEM auxiliary high-limit switch, identified by its light-blue cap, designed for the ACSH961155DXAA 96% AFUE gas furnace. This thermally activated safety control monitors temperature at its mounting location and opens the circuit if it senses an overheat condition — typically caused by restricted airflow from a dirty filter, blocked return, or a failing blower. When the switch opens, it interrupts the heating sequence to protect the heat exchanger and surrounding components from heat damage.
The blue color code corresponds to a specific factory trip temperature. The OEM 0130F00038 guarantees the correct setpoint and bracket fit. A generic or wrong-color switch can trip early (nuisance no-heat) or too late (unsafe). For a safety control, always match OEM specs exactly.
Disconnect power, note the wire positions, remove the two mounting screws, transfer the spade connectors, and secure the new switch. About 20 minutes. Important: if this switch was tripping, find and correct the root airflow cause (filter, blower, ductwork) — don't just replace the switch.