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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for WFD18090S4BXCB furnaces. This normally-closed thermal switch opens to shut off the gas valve if it senses an overheat or flame-rollout condition, then requires a manual button press to reset once the fault is cleared. It is a critical life-safety component — a failed or nuisance-tripping switch prevents the furnace from firing or, worse, disables protection.
The genuine OEM switch is calibrated to the exact factory trip temperature for this furnace. Because it is a safety control, an incorrectly rated generic switch can trip early (nuisance lockouts) or fail to trip when needed. For safety-critical parts, always install the OEM-specified component.
Easy — a two-wire, single-fastener replacement. Cut power, note the wire positions, unscrew the switch, transfer the leads, and mount the new one. Plan 15–30 minutes. If the old switch tripped, have a technician find the root cause (blocked airflow or rollout) before returning the furnace to service.