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The Goodman 10123517 Manual Reset Limit Switch is a genuine OEM safety control engineered for the Goodman GCH950453BXAB gas furnace and compatible models. This high-limit switch monitors heat-exchanger temperature and opens the circuit if the furnace overheats, protecting the equipment and your home. Because it is a manual-reset design, it requires a physical reset after tripping — a deliberate safety feature that prompts a technician to diagnose the root cause before the furnace runs again.
This is a factory-original Goodman component built to exact temperature and electrical tolerances. Generic substitutes may trip at incorrect setpoints, causing nuisance shutdowns or, worse, failing to protect the heat exchanger. For a critical safety control, we recommend the OEM part.
Difficulty: Easy (2/5). A two-wire swap that most handy homeowners can complete in 15–20 minutes. Always shut off power and gas before servicing. If the switch has tripped repeatedly, have a licensed HVAC technician inspect the airflow and heat exchanger.