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The Goodman 20162903 Primary Limit Switch (150°F) is a genuine OEM high-limit safety control for the Goodman GKS90703BXAB gas furnace and compatible models. Mounted on the heat exchanger/plenum, it opens the circuit if supply-air temperature exceeds its 150°F trip point — protecting the furnace from overheating due to restricted airflow, a dirty filter, or blower failure. This auto-reset switch restores operation once temperatures return to a safe range.
Genuine OEM 20162903 switches are calibrated to Goodman's exact 150°F trip point and mounting footprint. Generic limits may vary in trip temperature or bracket shape, causing nuisance shutdowns or inadequate protection. For a safety control, OEM is the reliable choice.
Easy (1/5). Two-screw, two-terminal replacement — disconnect power, unplug the leads, remove the mounting screws, and install the new switch in the same orientation. If the switch has been tripping, inspect airflow and the blower before returning the unit to service.