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The Goodman 20162903 is a genuine OEM primary high-limit switch with a 150°F trip point, designed for the VCES961005CNAA gas furnace. Mounted on the heat-exchanger bulkhead, it senses supply-air temperature and opens the gas valve / ignition circuit if the furnace overheats — typically from a dirty filter, blocked ducts, or a failing blower. Unlike the manual rollout switch, this auto-reset limit closes again once the cabinet cools, allowing normal operation to resume.
The 150°F setpoint and mounting flange are specific to this furnace's heat-exchanger design. Genuine Goodman OEM limits guarantee the correct trip temperature and bracket geometry. Generic limits with the wrong setpoint cause short-cycling on the high limit or fail to protect against overheating — a fire and cracked-heat-exchanger risk.
Moderate (2/5). Turn off power and gas, remove the two mounting screws and spade terminals, and swap in the new switch in the same orientation. After installing, confirm the furnace cycles off on the limit only under genuine over-temp conditions and check for adequate airflow.