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The Goodman 10123533 is an OEM manual-reset high-limit safety switch for VMSS960403ANAA 96% furnaces. This control opens the circuit and shuts down the burners if it senses an over-temperature or flame-rollout condition, protecting the heat exchanger and cabinet from heat damage. Because it is a manual-reset device, it stays tripped until an operator presses the reset button — a deliberate safety feature that flags an underlying airflow or combustion problem rather than silently cycling.
The OEM 10123533 is calibrated to the exact trip temperature specified for this furnace, with the correct terminal orientation and mounting bracket. Generic limit switches with mismatched set points can nuisance-trip or, worse, fail to open when needed. For a safety-critical control, always use the genuine OEM part.
Easy–Moderate (2/5). Power off the furnace, disconnect the two spade terminals, remove the mounting screws, and install the replacement in the same position. If the switch had tripped, diagnose the cause (dirty filter, blocked vent, weak blower) before returning the furnace to service.