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The Goodman 10123517 Manual Reset Limit Switch is a genuine OEM safety control engineered for the ACVC950714CXAA gas furnace and compatible Goodman/Amana models. This rollout-style switch monitors burner-area temperature and trips when it detects a flame rollout or excessive heat, shutting down the burners to protect the heat exchanger and your home. Because it is a manual-reset device, it locks open after a fault and must be physically reset once the underlying cause is corrected — a deliberate design that flags recurring combustion problems instead of silently cycling.
This is a genuine OEM switch built to the exact trip temperature and electrical rating specified by Goodman. Generic substitutes may carry a slightly lower price but can use incorrect trip points or terminals, risking nuisance lockouts or — worse — failure to trip. For a safety-critical control, OEM is the recommended choice.
Easy — typically a two-wire swap secured by one or two screws. Always disconnect power and gas before servicing. If the switch keeps tripping after replacement, have a licensed HVAC technician investigate the rollout cause.