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The Goodman 10123517 is a genuine OEM manual reset limit switch for GCV91155DXBA gas furnaces. This safety switch monitors temperature and opens the control circuit to shut down the burners if the furnace overheats or a flame rollout condition occurs. Because it is a manual reset device, it must be physically reset after a trip — a deliberate safety feature that flags an underlying fault. A failed or nuisance-tripping switch is a common cause of no-heat calls.
This genuine Goodman switch is calibrated to the exact trip temperature the furnace was engineered for. Generic switches with the wrong set point either nuisance-trip or fail to protect the equipment, which is a serious safety risk on a combustion appliance. Always use the OEM-spec limit switch.
Moderate (3/5). Disconnect power and gas, remove the access panel, note the wire routing, unscrew the old switch, transfer the leads to the new switch, and remount. Confirm proper seating against the heat exchanger or burner box. Best performed by an experienced DIYer or technician.
Always disconnect power and gas before servicing. A tripped limit switch indicates a real fault — diagnose the root cause. If unsure, consult a licensed HVAC technician.