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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the Goodman/Amana WFM18070S4BXCC gas furnace. This manual-reset high-limit (rollout) switch monitors for abnormal heat or flame rollout at the burner box and cuts power to the gas valve if a dangerous over-temperature condition occurs. Because it is manual-reset, it stays open until physically reset — a deliberate design that forces inspection before the furnace can restart, protecting your home and heat exchanger.
This genuine OEM switch is calibrated to the exact trip temperature Goodman engineered for this furnace's burner box. Generic limit switches may carry a different trip point, which can cause nuisance shutdowns or, worse, fail to protect at the right temperature. On a safety component, always fit OEM.
Easy — Shut off power and gas, snap two spade connectors off the old switch, remove one or two mounting screws, and reverse. Typically a 15-minute job. Confirm the switch is fully reset (button pressed in) after installation. If the switch keeps tripping after replacement, have a technician diagnose the root cause before running the furnace.