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The Goodman 10123517 is a genuine OEM manual reset limit switch for the WFD195090S5DAB gas furnace and compatible Goodman/Amana models. Unlike auto-reset limits, this high-limit safety switch stays open after a trip and requires a physical button press to restore the circuit — a deliberate design that forces a technician to investigate the root cause (blocked flue, failed blower, or flame rollout) before the furnace can fire again.
Because this is a life-safety component, exact trip temperature and terminal spacing matter. The OEM 10123517 is factory-calibrated to Goodman's specification, ensuring it opens at the correct overheat threshold and seats properly against the heat exchanger or burner box. Generic switches with approximate ratings can compromise the safety chain and may not satisfy inspection.
Moderate (2/5). About 20 minutes. Cut power, photograph the wiring, remove the mounting screws, transfer the terminals, and mount the new switch flush to its bracket. Important: if this switch has been tripping, replacing it is only half the job — a professional should diagnose why it overheated before returning the furnace to service.