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The Goodman 10123529 is a genuine OEM manual reset limit switch for the AMS81205DXAA gas furnace and compatible Goodman/Amana platforms. This normally-closed thermal safety control opens the ignition circuit if the furnace exceeds a safe temperature — protecting the heat exchanger from overheating due to restricted airflow, a failed blower, or a blocked flue. Because it is a manual-reset device, it must be physically reset after tripping, alerting the homeowner to an underlying fault.
OEM ensures the exact trip temperature, mounting footprint, and terminal orientation the furnace safety circuit was designed around. A generic switch with the wrong set point can trip prematurely or, worse, fail to protect the heat exchanger. For a safety-critical control like this, always use the OEM part.
Easy–Moderate (2/5). Two mounting screws and two spade terminals. Shut off power and gas, photograph wiring before disconnecting. If the switch keeps tripping, have a technician diagnose the root cause.