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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control built for AMVC800604 series furnaces. This high-limit switch monitors heat-exchanger temperature and cuts power to the gas valve if the furnace overheats, protecting the equipment and your home. Because it is a manual-reset design, a trip requires a deliberate button press — a signal that an underlying airflow or overheating issue should be inspected.
The OEM 10123529 is factory-set to the precise trip temperature specified for this furnace. Generic limit switches with the wrong cut-out point can either nuisance-trip or fail to protect the heat exchanger. For a safety-critical control, genuine OEM is strongly recommended.
Easy — Shut off power, disconnect the two spade terminals, remove the mounting screws, and install the replacement. Typically a 15–20 minute job for a DIYer.