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The Goodman 10123533 is a genuine OEM manual reset high-limit switch for the AMS950904CXAB gas furnace and compatible Goodman/Amana models. This safety control monitors heat-exchanger temperature and opens the circuit to shut down the burners if the furnace overheats — protecting against cracked heat exchangers, fire risk, and component damage. As a manual reset device, it requires a deliberate button press to restore operation, prompting the homeowner or technician to diagnose the root cause.
The OEM 10123533 is calibrated to the exact trip temperature specified for the AMS950904CXAB heat exchanger. Generic limit switches with the wrong setpoint either nuisance-trip or fail to protect the furnace at the correct threshold — a genuine safety concern. Use the factory-rated part to preserve the furnace's designed safety margins.
Moderate (2/5). Turn off power, note wire positions, unscrew the old switch from the heat-exchanger panel, mount the replacement, and reconnect the leads. Straightforward for an experienced DIYer; if the switch tripped, have the underlying overheating cause (airflow, dirty filter, blower) diagnosed before returning the unit to service.