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The Goodman 0130F00038 is a factory-original auxiliary limit switch (identified by its light-blue housing) engineered for the Goodman/Amana AMS80603AXAB gas furnace and compatible 80% AFUE models. This normally-closed thermal cutout is a critical safety component that monitors temperature at the blower or secondary heat-exchanger area and interrupts the burner circuit if airflow is lost or temperatures exceed safe limits, protecting the furnace from overheating and heat-exchanger damage.
This is a genuine OEM Goodman switch calibrated to the exact trip point specified for your furnace. Generic aftermarket limits may carry a different temperature rating or terminal orientation, risking nuisance lockouts or unsafe operation. For a safety device, matching the OEM calibration is strongly recommended.
Easy (2/5). Typically a two-wire, single-screw replacement. Disconnect power at the furnace, remove the blower-compartment or burner panel, photograph the wiring, transfer the leads, and mount. Most homeowners complete it in 15–20 minutes; if you're unsure, consult a licensed HVAC technician.