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The Goodman 10123529 is a genuine OEM manual reset high-limit switch engineered as a primary safety control for the WGFD28115V5CXAA gas furnace and compatible Goodman/Amana models. When heat exchanger temperatures exceed the factory setpoint — typically from a blocked filter, failed blower, or restricted ductwork — this switch opens the burner circuit to prevent overheating. Because it is a manual reset device, it requires a deliberate button press to restore operation, giving you a clear signal that an airflow or combustion fault occurred and needs attention.
This is the factory OEM part, calibrated to the exact trip temperature Goodman specified for your furnace. Generic universal limit switches may carry a different setpoint or mounting footprint, which can cause nuisance trips or, worse, allow unsafe operation. For a safety-critical control we strongly recommend the OEM 10123529.
Easy — DIY friendly. Two-wire spade connection with a single mounting bracket. Always disconnect power and gas before servicing. If the switch trips repeatedly after replacement, have a licensed HVAC technician inspect airflow and the heat exchanger.