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The Goodman 10123534 Manual Reset Limit Switch is the genuine OEM safety limit for GCH950904CXAA gas furnaces. This normally-closed switch opens on an overheat or flame-rollout condition to shut down the gas valve, then requires a manual button press to reset — a deliberate design so a repeat trip forces a technician to find the root cause.
The OEM switch is factory-calibrated to the exact trip temperature Goodman engineered for this heat exchanger. Generic limits with a different setpoint can nuisance-trip or, worse, fail to protect against a real overheat. Bracket and terminal spacing match the original mount.
Easy (2/5). Two screws and two spade terminals. Cut power and gas, note wire positions, swap, and press reset. If it trips again immediately, stop and diagnose airflow/rollout before running.