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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM safety switch for the GCH950453BXAD gas furnace. This high-limit control continuously monitors heat-exchanger temperature and cuts power to the gas valve if the furnace overheats — protecting the heat exchanger, blower, and your home from unsafe operating conditions. A failed limit switch is a common cause of short-cycling, no-heat calls, and safety lockouts.
Limit switches are calibrated to a specific trip temperature matched to the furnace's heat-exchanger design. This genuine OEM control uses Goodman's factory-set cut-out and reset points, so it protects the equipment correctly. Generic switches with the wrong trip point can cause premature lockouts or, worse, fail to protect against overheating.
Moderate (2/5) — Cut power at the disconnect, unplug the two wire leads, remove the mounting screws, and swap in the new switch. A straightforward job for a confident DIYer; verify correct orientation against the heat-exchanger opening.