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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for WFD18070S3AXCC furnaces. It monitors heat-exchanger temperature and opens the burner circuit if the furnace overheats — for example from restricted airflow or a failed blower. The manual reset requires a technician to inspect the cause and press the button before heat resumes, an important safety feature.
The genuine Goodman switch is calibrated to the exact cut-out temperature engineered for this heat exchanger. Generic limits with a different trip point can nuisance-trip or, worse, fail to protect the unit. As a life-safety component, we strongly recommend the OEM part.
Easy to moderate. Disconnect power, remove two mounting screws, transfer the two spade terminals, and mount the new switch. Plan 15–20 minutes. Always determine and correct the root cause of any overheat before returning the furnace to service.