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The Goodman 10123529 is a genuine OEM manual reset high-limit safety switch engineered for the WFM18115S5CXCC gas furnace and other compatible Goodman and Amana models. This switch monitors heat-exchanger and burner-compartment temperature and trips the circuit if the furnace overheats — a critical safety component that prevents damage from restricted airflow, a failed blower, or a blocked flue. Because it is a manual reset design, it requires a physical button press to restore operation after a trip, alerting the homeowner or technician that a fault condition occurred.
This is a genuine OEM Goodman part, calibrated to the exact trip temperature specified for your furnace. Generic aftermarket limit switches often use approximate trip points that can cause nuisance shutdowns or, worse, fail to protect the heat exchanger. For a life-safety component like a rollout switch, OEM is strongly recommended.
Easy (2/5). Typically a two-wire connection secured by one or two screws. Always shut off gas and power at the disconnect before servicing. If the switch has tripped repeatedly, diagnose the underlying overheating cause before replacing.
Ships fast with our exact-fit guarantee. If you're unsure this matches your unit, contact us at info@nationalhvacparts.com with your model and serial number.