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The Goodman 20162903 Primary Limit Switch is a genuine OEM high-limit safety control for the VMES960403ANAA gas furnace. This normally-closed thermal switch opens at approximately 150°F to shut off the burners if the heat exchanger overheats — protecting the furnace and your home from unsafe temperatures. A failed limit switch is a common cause of no-heat calls and short cycling.
Because this is a safety-rated component, the factory Goodman switch is calibrated to the exact trip point and reset behavior your furnace's control sequence expects. Generic limits with a mismatched set-point can trip early (nuisance shutdowns) or too late (unsafe overheating). OEM is strongly recommended for any limit control.
Easy. Remove power, disconnect the two spade terminals, unscrew the switch from the heat exchanger panel, and mount the replacement in the same orientation. Most techs complete this in under 15 minutes.