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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for the VCES800603AXAA gas furnace. It monitors heat-exchanger and burner-area temperature and interrupts the gas/ignition circuit if it exceeds a safe threshold. Because it is a manual reset design, it stays open after a trip and must be physically reset by pressing its button — a deliberate feature that forces a service check after an overheat or flame-rollout event.
The OEM switch carries the exact trip temperature and mounting bracket for this furnace. Generic universal limits often have a different set-point or footprint, leading to nuisance trips or improper mounting against the heat exchanger. On a flame-safety control, OEM specification matching is essential.
Easy (2/5). Cut power, remove the two spade terminals, unscrew the switch from its bracket, and mount the replacement. Around 15–20 minutes. A tripped manual-reset limit indicates a real overheat — inspect the heat exchanger, airflow, and burners before resetting.