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The genuine Goodman 10123529 Manual Reset Limit Switch is a factory-original safety control engineered for the Goodman/Amana AMH81005CXBB gas furnace and compatible 80% AFUE models across the Goodman, Amana, and Janitrol family. This normally-closed switch monitors heat exchanger and burner-area temperature and opens the 24V control circuit if a dangerous overheat or flame rollout condition occurs, shutting the furnace down to protect the equipment and your home.
This is the true OEM Goodman component, calibrated to the exact factory trip temperature. Generic aftermarket switches may trip early (nuisance shutdowns) or late (unsafe), and often lack the correct mounting bracket and button placement. For a safety device, we recommend OEM — but a tested generic equivalent is available if budget is the priority.
Easy (1/5). Two mounting screws and two spade terminals. Always disconnect power at the breaker before servicing. If the switch trips repeatedly after reset, investigate airflow, a dirty filter, or a blocked flue before replacing — the switch is doing its job.