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The Goodman 10123529 is a genuine OEM manual reset limit switch engineered for the DMP150-52AA gas furnace. This high-limit safety control monitors heat exchanger temperature and permanently interrupts the burner circuit if the furnace overheats. Because it is a manual reset design, it will not automatically re-close after a fault — requiring an operator to press the reset button, which flags an underlying airflow or venting problem before the unit can run again.
This is the genuine Goodman OEM switch, calibrated to the exact trip temperature specified for the DMP150 series. Generic aftermarket limit switches may trip at incorrect temperatures, causing nuisance lockouts or, worse, failing to protect the heat exchanger. For a life-safety component, OEM is strongly recommended.
Easy (1/5) — Two mounting screws and quick-connect terminals. Always shut off power and gas before servicing. Recommended for HVAC technicians; homeowners should confirm the root cause of any trip before replacing.