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The Goodman 10123529 is a genuine OEM manual reset high-limit switch for DMP150-52AB gas furnaces. This safety control opens the circuit and shuts down the burners if the heat exchanger overheats, protecting against fire and cracked exchangers. Because it is a manual reset, it requires a deliberate button press to restore heat after a trip — a signal that the underlying airflow or overheating condition should be inspected.
The genuine Goodman OEM switch is calibrated to the exact trip temperature specified for this furnace. Generic limit switches with the wrong setpoint can nuisance-trip or, worse, fail to trip in time. For a code-compliant, safety-critical part, always choose OEM.
Easy (1/5). Cut power to the furnace, disconnect the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Under 15 minutes with a nut driver. If it trips again after reset, diagnose airflow (dirty filter, blocked coil) before running.