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The Goodman/Amana 10123529 is a factory OEM manual-reset limit switch for the AMVC80604BXCA 80% AFUE two-stage gas furnace. This safety control opens the electrical circuit and shuts the furnace down if it detects an over-temperature or flame-rollout condition, protecting the heat exchanger and preventing unsafe operation. Because it is a manual-reset device, it stays locked out until a technician presses the reset button — a deliberate design that flags a fault requiring inspection rather than silently cycling.
Genuine 10123529 switches are calibrated to the exact trip temperature Goodman specified for this furnace. Because this is a life-safety control tied to CO and rollout protection, an incorrectly rated generic switch can trip too late — or never — defeating the safety. Always use the OEM part for limit and rollout switches.
Rating: Easy to Moderate. The switch mounts with two screws and two spade terminals. Disconnect power, transfer the wires one at a time, and mount the new switch in the same orientation. If the old switch tripped, have a technician diagnose the root cause (blocked airflow, cracked exchanger) before returning the unit to service. Typical time: 10–20 minutes.
Confirm the number on your existing switch before ordering.