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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-temperature safety cutoff for the Goodman/Amana AMH950904CXAF gas furnace. If the furnace overheats — commonly from a restricted filter, blocked ducts, or blower failure — this switch opens the control circuit and shuts down the burners, then requires a manual reset to restore operation. That deliberate lockout protects the heat exchanger from damage and your home from fire risk.
Limit switches are calibrated to a specific cutout temperature for your furnace's heat exchanger. The OEM 10123533 opens at the factory-set point, ensuring reliable overheat protection. Generic switches with the wrong trip temperature may nuisance-trip or, worse, fail to protect. For a safety cutoff, OEM is the right choice.
Easy — Two spade-terminal wires and one or two mounting screws. A DIYer can swap it in about 15 minutes. Address the underlying cause of any overheat (dirty filter, airflow) before returning the furnace to service.
Shut off power and gas before servicing.