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The 10123529 is a genuine Goodman/Amana manual reset limit switch designed for the AMES800804BXAA gas furnace and other compatible AMES80-series models. This safety control monitors temperature and opens the circuit if the furnace overheats or experiences flame rollout, shutting the unit down to protect the heat exchanger and surrounding components. Because it is a manual reset device, it must be pressed to reset after tripping — a deliberate design that forces inspection of the underlying cause before the furnace can run again.
OEM limit switches are calibrated to the exact trip temperature and mounting footprint specified for your furnace. A generic switch with a different set point can trip too early (nuisance shutdowns) or too late (a genuine safety hazard). For a safety-critical control, always use the factory-specified part.
Easy–Moderate (2/5). Typically two mounting screws and two spade terminals. Cut power and gas before servicing, and diagnose why the original tripped (blocked airflow, dirty filter, rollout) before restoring operation. When in doubt, call a licensed HVAC technician.