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The Goodman 10123529 is a genuine OEM manual-reset limit (flame-rollout) switch for the VMS80805CXAA gas furnace. This normally-closed safety mounts on the burner box and trips if flame rolls out of the heat exchanger — a symptom of blocked venting or a cracked exchanger. Because it requires a manual reset button press to restore, it forces a service inspection rather than silently re-igniting an unsafe condition.
The OEM rollout switch is calibrated to the factory trip temperature and terminal layout, ensuring it opens at exactly the right point. Generic switches with different set points may nuisance-trip or, worse, fail to protect against rollout. This is a life-safety device — always use OEM.
Easy (1/5). Two spade terminals and a mounting screw. If this switch tripped, diagnose and correct the venting/heat-exchanger cause before resetting. Disconnect power and gas before servicing.