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The Goodman 10123529 is a genuine OEM manual reset high-limit / rollout safety switch built for the Goodman/Amana ACVC800803BXAB gas furnace. This thermal switch opens the control circuit the moment it detects an over-temperature or flame-rollout condition, shutting down the burners to protect the heat exchanger and your home. Because it is a manual reset device, it stays tripped until you press the button — a deliberate safety feature that flags a problem instead of silently cycling.
The OEM 10123529 is calibrated to the exact trip temperature your furnace's safety logic expects. Generic substitutes may trip early (nuisance no-heat calls) or late (a genuine safety risk). On a flame-safety component, the factory part is strongly recommended.
Difficulty: Easy — Usually a 10–20 minute job. Cut power at the disconnect, photograph the wiring, remove the two spade terminals and mounting screws, install the new switch, and reconnect. If the old switch tripped, diagnose the root cause (blocked airflow, failed blower, or cracked heat exchanger) before returning the furnace to service.