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The Goodman 20162903 is a genuine OEM primary high-limit switch rated to open at 150°F, built for the Goodman VMES800805CXAA gas furnace. This safety control monitors heat-exchanger temperature and cuts power to the gas valve if the furnace overheats — protecting against restricted airflow, a failed blower, or a dirty filter. If your furnace short-cycles, trips on limit, or the burners shut off prematurely, a faulty limit switch is a frequent culprit.
OEM limit switches are matched to Goodman's exact trip point and mounting footprint. Generic switches may carry a nearby temperature rating but differ in reset behavior or terminal placement, which can cause nuisance trips or an unsafe delay in shutoff. On a safety component, OEM is strongly recommended.
Install difficulty: Easy to Moderate. Disconnect power, remove two mounting screws, transfer the wire leads, and reinstall. A multimeter continuity check confirms the old switch has failed.