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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-limit safety control designed for the GMH950704CXAD 96% AFUE two-stage gas furnace and compatible Goodman/Amana models. This switch monitors heat-exchanger and plenum temperatures and interrupts the burner circuit if the furnace overheats — protecting the heat exchanger, blower, and surrounding components from thermal damage. As a manual reset device, it stays open after a fault until you physically press the reset button, ensuring an overheat condition is inspected before the furnace fires again.
This is a genuine Goodman OEM switch — the trip temperature and terminal configuration match your furnace's original engineering exactly, so the burner control board reads it correctly and cycles as designed. Aftermarket universal limit switches often carry approximate trip points that can cause nuisance lockouts or, worse, fail to protect at the correct temperature. For a safety-critical control we recommend the OEM part.
Rated Easy (2/5) — roughly a 20-minute repair for most homeowners. Shut off power at the disconnect and gas supply, remove the two mounting screws, transfer the wire leads to the new switch, and reinstall. A basic multimeter to confirm continuity is helpful but not required. Always restore power only after the panel is secured.