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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for GMH950904CXAF 95% AFUE furnaces. This thermal cutout opens the gas/ignition circuit if the heat exchanger or burner compartment exceeds safe temperature — protecting against overheating from a blocked filter, failed blower, or restricted ductwork. Unlike auto-reset limits, this switch must be manually reset after a trip, alerting the homeowner that a fault occurred.
OEM (this part): Factory-calibrated trip temperature and exact bracket/terminal fit for correct safety response. Generic: Aftermarket limits may carry the wrong temperature rating, causing either nuisance trips or delayed protection. Safety switches should always be replaced with OEM at the factory temperature.
Easy (1/5) — about 15 minutes. Disconnect power, remove two mounting screws, transfer the two wire terminals, and reinstall. Always diagnose why a limit tripped (airflow, blower, filter) before returning the furnace to service.