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This genuine OEM Goodman 10123533 manual reset limit switch is a direct-fit replacement for GKS90904CXAG gas furnaces and compatible Goodman/Amana models. Manual reset limits are safety cutouts: if the furnace overheats or a flame rollout occurs, the switch opens the control circuit and shuts the unit down, and it stays open until a person physically presses the reset button. This prevents the furnace from automatically re-firing into a dangerous condition.
The OEM 10123533 is set to the exact trip temperature specified for this furnace's heat exchanger and burner box, with the correct bracket and terminal orientation. Generic limits with the wrong setpoint can nuisance-trip or, worse, fail to protect. Because this is a life-safety device, the factory-rated OEM part is strongly recommended.
Easy (1 of 5). Disconnect power, note wire positions, remove the two spade terminals and mounting screws, and install the replacement. A repeated trip after reset means an underlying problem — restricted airflow, a dirty filter, a cracked heat exchanger, or flame rollout — that must be diagnosed before returning the furnace to service. Do not bypass or jump out a manual reset limit.