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The Goodman 20162903 Primary Limit Switch is a genuine OEM high-limit control rated to trip at 150°F, engineered for the Goodman/Amana VMES960603BNAA gas furnace. Mounted on the heat-exchanger bulkhead, this auto-reset thermal switch protects against overheating caused by restricted airflow — a dirty filter, blocked return, or failed blower. When supply-air temperature exceeds the setpoint, the switch opens and shuts off the gas valve, then automatically closes once the furnace cools.
OEM vs. Generic: The 150°F trip point and disc mounting are specific to this furnace's heat-exchanger design. The OEM 20162903 guarantees the correct calibration; a generic snap-disc with a different setpoint can cause nuisance lockouts on cold days or fail to protect the heat exchanger. For a safety limit, OEM is the right call.
Install Difficulty: Easy (2/5). Cut power, photograph the wiring, remove two mounting screws, transfer the spade terminals, and reinstall. Clean or replace the air filter and confirm proper airflow, since restricted air is the most common cause of high-limit trips.