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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for the Goodman GMP150-5 gas furnace. This switch monitors heat exchanger temperature and cuts power to the gas valve if the furnace overheats, protecting the unit and your home from unsafe conditions. As a manual-reset device, it stays tripped until physically reset — a deliberate safety feature that flags a fault needing attention. A failed or nuisance-tripping limit switch causes no-heat conditions and short cycling.
The OEM Goodman 10123529 limit switch is calibrated to the exact trip temperature Goodman specifies for the GMP150-5. Because this is a safety device, an incorrectly rated generic switch can trip too early (nuisance no-heat) or too late (unsafe). Always use the OEM-matched temperature rating for safety controls.
Cut power before servicing. Remove the two mounting screws, transfer the wire leads to the new switch, and remount. Typically 20–30 minutes with basic tools. Since this is a life-safety component on a gas appliance, we recommend a licensed HVAC technician verify correct operation after installation.