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The Goodman 20162903 is a genuine OEM primary high-limit switch rated to open at 150°F for AMES960403ANAA gas furnaces. Mounted on the heat exchanger or blower deck, this auto-reset switch monitors supply-air temperature and cuts the gas valve if the furnace overheats — typically from restricted airflow, a dirty filter, or a failed blower. It closes again once temperatures return to normal, restoring the heat cycle automatically.
The OEM Goodman switch is calibrated to the precise 150°F set point and probe/disc length your furnace requires. Generic snap-disc limits with the wrong temperature rating or insertion depth can cause short-cycling or fail to protect the heat exchanger. On a safety limit, matching the factory spec exactly matters.
Moderate. Turn off power and gas, remove the panel, disconnect the two terminals, and unscrew the limit from its mounting. Confirm the 150°F rating and disc length match the original before installing. Always correct any airflow restriction that caused a trip.
Genuine Goodman quality. Need help matching your switch? Email info@nationalhvacparts.com.