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The Goodman 10123533 is a genuine OEM manual-reset limit switch for AMS950905DXA gas furnaces and matching Goodman/Amana models. This safety control opens the ignition circuit when it senses over-temperature at the heat exchanger or burner box, protecting the furnace and home from a rollout or blocked-airflow condition. Because it is a manual-reset device, it must be physically reset with the red button after the fault clears — a tripped switch is a warning that the root cause (dirty filter, blocked vent, failed blower) should be investigated.
OEM limit switches are matched to the exact trip temperature of your furnace's heat exchanger. Generic substitutes with the wrong setpoint can either fail to protect the equipment or nuisance-trip during normal high-fire operation. For a safety-critical control, use the factory-specified part.
Easy (1/5). Kill power at the disconnect, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. About 10 minutes. Never bypass or jumper a safety limit.