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The Goodman 10123529 Manual Reset Limit Switch is the genuine OEM high-temperature safety control for AMH81205DXBA gas furnaces and compatible Goodman/Amana models. This manual-reset switch trips and stays open on a dangerous over-temperature or flame-rollout event, requiring a technician to press the button to restore the circuit — a deliberate design that flags a serious underlying problem such as a cracked heat exchanger, blocked flue, or failed blower before the furnace is allowed to run again.
The OEM 10123529 is calibrated to the exact trip temperature Goodman specifies for this furnace's safety circuit. Because this is a manual-reset safety, using a switch with the wrong setpoint compromises rollout protection. Always match the OEM part for correct, code-compliant operation.
Rated Easy — about 15 minutes. Disconnect power, remove the mounting screws, transfer the spade connectors, and remount. Important: if this switch tripped, diagnose and correct the root cause (airflow, venting, heat exchanger) before returning the furnace to service.