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The Goodman 10123535 Manual Reset Limit Switch (Red) is a genuine OEM overheat safety control for the GKS90704CXAF gas furnace. This red-button high-limit / rollout switch interrupts the ignition circuit when it detects excessive temperature caused by flame rollout, a blocked flue, or restricted airflow. The manual reset requires hands-on inspection before the furnace can restart, ensuring the fault is corrected rather than masked. The red button distinguishes it from other limit switches on the unit by trip rating and location.
Because the red 10123535 and similar switches differ by temperature trip point, using the exact OEM part matters. The 10123535 carries the factory-specified rating for its position in the GKS90704CXAF. A generic or wrong-color substitute may trip at the wrong temperature — causing nuisance lockouts or failing to protect the furnace. Always match the OEM part number and color.
Easy (2/5). Turn off power and gas, transfer the two wire leads, and mount the replacement in the original orientation. Verify you are replacing the correct switch (the red one) and diagnose the cause of any trip before resetting and returning the unit to service.
Fits Goodman GKS90704CXAF furnaces. Confirm your model number before ordering.