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The Goodman 10123533 is a genuine OEM manual reset high-limit / rollout safety switch for the GMH950904CXAG 96% AFUE gas furnace and compatible Goodman/Amana models. It monitors temperature at the burner or heat exchanger area and opens the control circuit if it detects an overheat or flame rollout condition, shutting down the furnace until an operator manually resets it.
The OEM Goodman switch is set to the exact trip temperature and bracket profile specified for this furnace. Because it is a safety device, an incorrectly rated generic switch could either nuisance-trip or fail to protect against a genuine overheat. OEM is the safe, correct choice.
If this switch has tripped and won't reset, it often indicates a blocked heat exchanger, restricted airflow, or flame rollout — investigate the root cause before returning the unit to service.
Easy — Typically two spade terminals and one or two mounting screws. Straightforward to replace, but the underlying overheat cause should be diagnosed by an HVAC professional. Shut off power and gas before servicing.