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The 10123539 is a genuine Goodman manual-reset high-limit safety switch for the VMES960804CNAA modulating gas furnace. This normally-closed thermal switch monitors temperature at the heat exchanger or burner area and opens the circuit if it detects an overheat or flame-rollout condition, shutting down the furnace to prevent damage and hazard. Because it is a manual reset device, it must be pressed to restore operation after it trips — a deliberate design that flags a fault for inspection rather than silently cycling.
A limit switch is a life-safety component — trip temperature and mounting must be exact. Generic switches with incorrect setpoints can nuisance-trip or, worse, fail to trip. The genuine Goodman 10123539 is calibrated to factory specification for reliable overheat protection.
Moderate (3/5). Involves removing wire leads and mounting screws and correctly reseating the sensing element. Basic tools required.
Always disconnect power and gas before servicing. If a limit switch has tripped, have the underlying cause (airflow restriction, blower fault, or heat exchanger issue) diagnosed by a licensed HVAC technician before returning the furnace to service.