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The Goodman 20162904 is a genuine OEM primary high-limit temperature control for Goodman gas furnaces including the GKS90453BXAE. This safety switch monitors heat-exchanger temperature and cuts power to the gas valve if the furnace overheats — typically due to restricted airflow, a dirty filter, or a failing blower. A tripped or failed limit control is a common cause of short-cycling and no-heat calls.
Limit switches are calibrated to a specific trip temperature and mounting geometry. A generic switch with the wrong setpoint will nuisance-trip or, worse, fail to protect the heat exchanger. This genuine OEM 20162904 carries Goodman's exact temperature rating and bracket for a true drop-in, safe replacement.
Easy to Moderate. Cut power to the furnace, disconnect the two spade terminals, remove the mounting screws, and install the new control in the same orientation. Most replacements take 15–25 minutes.
Safety: This is a safety-critical component — never bypass a limit switch. If the new control trips, diagnose the underlying airflow issue.