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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM overheat safety cutout engineered for the GKS91155DXAF gas furnace. It continuously monitors temperature at the heat exchanger or burner box and breaks the control circuit the moment an unsafe overheat condition occurs. Because it is a manual reset switch, it stays open until the button is physically pressed — ensuring the fault is investigated rather than silently ignored.
Each Goodman limit switch is calibrated to a specific trip temperature matched to the furnace's heat exchanger design. Installing this genuine OEM part guarantees the correct cutout point, avoiding both nuisance lockouts and the serious safety risk of a switch that fails to open during a real overheat. Generic equivalents rarely match the factory setpoint.
Easy. Kill power to the furnace, unscrew the switch, move the two spade terminals to the new unit, and remount it in the identical position. A repeated trip signals a deeper airflow or combustion problem — have a qualified HVAC technician diagnose the root cause before restoring operation.