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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the Goodman GMPE075-3A furnace. This normally-closed switch opens and cuts power to the gas valve if it senses an over-temperature or flame-rollout condition, protecting the heat exchanger and cabinet. Because it is a manual reset device, it must be pressed to reset after a trip — and repeated trips indicate an underlying airflow or combustion fault that should be investigated, not just reset.
This genuine OEM switch is calibrated to the exact trip temperature Goodman engineered for this furnace. A generic switch with a different trip point or mounting footprint can nuisance-trip or, worse, fail to protect at the correct temperature. On a safety-critical control, always use the OEM-rated part.
Easy (2/5). Typically one or two mounting screws and two spade terminals. Cut power at the furnace first, note the wiring, and confirm the replacement's trip rating matches. Verify normal operation after install. If the switch keeps tripping, have a licensed technician diagnose airflow or heat-exchanger issues.