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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM high-limit safety control engineered for the Amana/Goodman AMES960403ANAA gas furnace and compatible models. This normally-closed thermal switch opens the control circuit if it senses excessive temperature, shutting down the burners to protect the heat exchanger and blower assembly from overheating.
This is the factory-specified OEM part, calibrated to the exact trip temperature your furnace's control board expects — no guesswork on setpoints. Generic aftermarket limits may fit physically but can trip early or late, causing nuisance lockouts or bypassing critical protection. For a safety component, OEM is strongly recommended.
Easy — typically a two-wire spade-connector swap on a single mounting screw. Always disconnect power before servicing. If unsure, consult a licensed HVAC technician.