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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for Goodman ACVC81005CXCA gas furnaces. This switch opens the control circuit when it senses an overheat or flame-rollout condition, shutting down the furnace to protect the heat exchanger and prevent unsafe operation. Because it is a manual reset device, it must be physically reset after a trip — and a switch that trips repeatedly indicates an underlying airflow or combustion fault that should be diagnosed.
The genuine Goodman OEM switch is calibrated to the exact trip temperature specified for your furnace. Generic switches with a different set point can either nuisance-trip or, worse, fail to trip when needed — defeating a critical safety function. For safety controls, always use the OEM-rated part.
Easy to Moderate — a two-wire, bolt-in replacement, but a tripping limit signals a real problem. Have a technician confirm proper airflow and combustion rather than simply resetting or replacing the switch repeatedly.