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The Goodman 10123533 manual reset limit switch is a genuine OEM high-limit safety control for the VMES960403ANAA gas furnace and compatible Goodman/Amana models. This normally closed switch opens the control circuit if it senses excessive temperature — the classic symptom of a blocked heat exchanger, failed blower, or flame rollout — shutting the furnace down before damage or an unsafe condition can develop. Because it is a manual reset design, it must be physically reset by pressing its button after a trip, ensuring a technician inspects the root cause rather than letting the furnace short-cycle on a fault.
Trip temperature and reset behavior are safety-critical. The OEM 10123533 is calibrated to the furnace's exact limit setpoint and mounting footprint. Generic limit switches with approximate ratings can trip prematurely or, worse, allow overheating — never compromise on a primary safety control.
Easy (2/5). Disconnect power, remove the two mounting screws and spade terminals, and install the replacement in the same location and orientation. About 15–20 minutes. After installing, always diagnose and correct whatever caused the original trip.