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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for Goodman/Amana VMES800804BXAA 80% AFUE gas furnaces. This normally-closed switch opens the control circuit if it senses an overheat or flame-rollout condition, shutting the furnace down to prevent heat-exchanger damage and unsafe operation. Its manual-reset button requires a technician to physically reset it, ensuring a fault is investigated rather than silently cycling.
Genuine OEM 10123529 is calibrated to the exact trip temperature Goodman engineered for this furnace's heat exchanger and airflow. A generic switch with the wrong trip point can nuisance-trip or, worse, fail to protect against a real overheat. Because this is a life-safety component, we strongly recommend OEM only.
Replacement typically takes 20–30 minutes. With power off, disconnect the two spade terminals, unscrew the switch from the burner/vestibule bracket, mount the new switch, and reconnect. If the switch tripped, always diagnose the root cause (blocked flue, rollout, poor airflow) before returning the furnace to service. Cut power at the disconnect first.