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The Goodman 10123517 Manual Reset Limit Switch is a genuine OEM safety control for the WGFD295070V4CAA gas furnace and compatible Goodman/Amana models. This high-limit switch monitors furnace temperature and opens the circuit if it detects an overheat or flame-rollout condition, shutting down the burners to protect the heat exchanger and your home. Because it's a manual reset design, it stays tripped until physically reset — a deliberate safeguard that flags a fault for inspection rather than silently cycling.
OEM vs. Generic: The genuine Goodman switch is calibrated to the exact trip temperature specified for this furnace. Generic substitutes with the wrong set point can trip nuisance shutdowns or, worse, fail to trip when needed. For a life-safety component, always use the factory-matched OEM part.
Install Difficulty: Moderate (3/5) — requires disconnecting power, removing wiring leads, and mounting the switch in the correct location. A repeatedly tripping limit indicates an underlying airflow or combustion issue that should be diagnosed. Recommended for experienced DIYers or a licensed HVAC technician.