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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch (identified by its light-blue body) for GCH950904CXAD gas furnaces and compatible Goodman/Amana models. This normally-closed thermal safety monitors temperature in the blower or return-air area and opens the circuit to shut the furnace down if it overheats — protecting the heat exchanger and cabinet from heat damage caused by restricted airflow, a dirty filter, or blower failure.
The trip temperature is factory-calibrated and color-coded — substituting a generic switch with the wrong setpoint can either allow dangerous overheating or cause constant nuisance lockouts. The genuine OEM 0130F00038 guarantees the exact rated trip point Goodman specifies.
Easy. Disconnect the two spade terminals, remove the mounting screws, and install the replacement — roughly 15 minutes. Always cut power and gas before servicing, and verify the switch matches the light-blue OEM setpoint.