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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the AMVC800804CXAA two-stage variable-speed 80% AFUE gas furnace. This manual-reset high-limit (rollout) switch monitors burner-compartment temperature and instantly interrupts the gas valve if flame rolls out or the heat exchanger overheats. Because it is manual-reset, it will not automatically re-close after a trip — a deliberate safety design that forces a technician to find and correct the underlying fault before the furnace can fire again.
Safety limit switches must trip at a precise factory-set temperature. The OEM 10123529 is calibrated to this furnace's exact rollout threshold. Generic switches with a different set point can fail to protect the heat exchanger or nuisance-trip during normal operation. On a life-safety component, OEM is strongly recommended.
A quick swap: disconnect power and gas, unplug the two spade terminals, remove the mounting screws, and install the new 10123529 in the same orientation. If the original tripped, a technician should diagnose the rollout cause (cracked heat exchanger, blocked flue, dirty burners) before returning the unit to service.