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The Goodman 10123539 Manual Reset Limit Switch is a genuine OEM safety control designed as a direct-fit replacement for the Goodman VMSS960603BNAA gas furnace and compatible models. This high-limit / rollout switch monitors furnace temperature and trips to shut off the burners if a dangerous overheat or flame-rollout condition is detected, protecting the heat exchanger and your home. Because it is a manual-reset design, a technician must physically reset the button after diagnosing and correcting the underlying fault.
The genuine Goodman OEM 10123539 is calibrated to the furnace's exact trip temperature — a critical safety specification. Generic limit switches with incorrect trip points can nuisance-trip or, worse, fail to open when needed. For a safety-rated component, always install the OEM part to preserve certified furnace operation.
Moderate (2/5). Requires disconnecting two spade wire terminals and unscrewing the switch bracket. Always shut off electrical power and the gas supply before servicing. Because this is a safety control, confirm the root cause of any trip. Professional installation is recommended for anyone unfamiliar with furnace wiring.