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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-limit safety control for AMEH960403BXAA gas furnaces. This switch monitors temperature and opens the circuit if the furnace overheats or a flame-rollout condition occurs, shutting down the gas valve to protect the equipment and the home.
Because it is a manual-reset device, it must be physically reset with the button once tripped — a deliberate safety feature that forces a technician to inspect the cause before the furnace can restart. A switch that will not reset or trips repeatedly should be replaced with this exact OEM part.
OEM limit switches are calibrated to the exact trip temperature specified by Goodman for this model. A generic switch with the wrong set point can either nuisance-trip or, worse, fail to protect the furnace. For a safety control, OEM is essential — never substitute an uncalibrated part.
Moderate — disconnect power, note wire terminals, and mount the switch in the original location with correct orientation. Never bypass a tripped limit switch. Installation and diagnosis of the overheat cause should be handled by a qualified HVAC technician.