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The genuine Goodman 10123529 Manual Reset Limit Switch is the OEM high-limit safety control for ACVC800603BXAA gas furnaces. This switch monitors heat-exchanger/plenum temperature and cuts power to the gas valve if the furnace overheats — protecting against blocked airflow, a failed blower, or a dirty filter. Because it is a manual reset device, it must be physically reset after a trip; if it won't reset or trips repeatedly, the switch is faulty and should be replaced with this OEM part.
The OEM switch is calibrated to the exact trip and reset temperatures Goodman specified for this furnace, with the correct bracket and terminal layout. Generic limit switches with the wrong setpoint can either nuisance-trip or, worse, fail to protect the heat exchanger. For a critical safety component, always use the factory-matched OEM part.
Easy (2/5) — Shut off power and gas, remove the two mounting screws and spade connectors, and install the new switch in the same orientation. Takes about 15 minutes. Confirm the cause of any previous trip (clogged filter, blower fault) before returning the furnace to service.