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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM thermal safety cutout for the Amana/Goodman AMH80603ANBC gas furnace and related AMH/GMH models. This normally-closed limit opens on excessive temperature to shut down the burners, protecting the heat exchanger and cabinet from overheating caused by restricted airflow or a failed blower.
Limit switches are safety-rated devices — the light-blue OEM part is factory-matched to the exact trip and reset temperatures your furnace design requires. A generic switch with the wrong set point can either nuisance-trip (no heat) or fail to protect the unit. Always use the correct genuine OEM limit for safe operation.
Easy — A 10–20 minute repair. Cut power, note wire positions, remove two mounting screws, transfer the leads, and reinstall. Never bypass a tripped limit — always find and correct the underlying airflow restriction (dirty filter, blocked coil, or blower fault).
Confirm the light-blue color code and part number against your unit before ordering.