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The 10123529 is a genuine OEM manual reset high-limit safety switch for the Goodman GMPE100-4 gas furnace and compatible Goodman/Amana models. It monitors heat exchanger and rollout temperatures and opens the circuit to shut down the burners if the furnace overheats. Because it is a manual reset design, it will not automatically restore power — a technician must correct the underlying fault (restricted airflow, blocked flue, or rollout) and press the reset button, adding an important layer of safety.
This safety component is calibrated to Goodman's exact trip temperature. Generic limit switches may open at the wrong setpoint — nuisance-tripping or, worse, failing to protect the furnace. For a life-safety device, we strongly recommend the genuine OEM switch.
Moderate (3/5). The switch mounts with two screws and two spade connectors, but correct positioning on the heat exchanger or burner box matters. Shut off gas and power first; if the switch has tripped, have a professional diagnose the root cause before resetting.