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The Goodman 0130F00038 Auxiliary Limit Switch is a genuine OEM safety control engineered for the ACEC800403AXAB and compatible Goodman/Amana gas furnaces. This light-blue auxiliary (rollout/high-limit) switch monitors temperature at the burner assembly and interrupts the gas valve circuit if the unit overheats or flame rollout is detected — a critical safety function that protects the heat exchanger and your home.
This is a factory-original Goodman component, calibrated to the exact trip temperature specified for your furnace. Generic universal limit switches may carry the wrong cutout rating, which can cause nuisance lockouts or, worse, fail to protect against true overheat conditions. For a safety-critical control, OEM is strongly recommended.
Difficulty: Easy — typically a two-wire spade-terminal swap with a single mounting screw. Always shut off power and gas before servicing. If you are not comfortable working near the burner assembly, consult a licensed HVAC technician.