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The Goodman 10123537 is a genuine OEM gray manual reset high-limit safety switch for the WGFM295070V4CAA gas furnace and compatible Goodman/Amana models. It monitors furnace temperature and interrupts the burner circuit during an over-temperature or flame rollout event, then holds the circuit open until the reset button is manually pressed. The gray body color denotes a specific factory trip-temperature calibration — always match the exact part number for the correct rating.
The OEM 10123537 is factory-calibrated to the trip point required for this furnace. As a safety-critical control, a mismatched generic switch risks nuisance shutdowns or, worse, failure to protect the heat exchanger. OEM is strongly recommended, and the color/rating must match the original.
Easy (2/5) — Straightforward two-terminal replacement with mounting screws. Cut power, transfer leads and mounting orientation, and press reset after install. Typical replacement time: 20–30 minutes. Diagnose and fix the over-temperature cause before resetting.