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The Goodman 20162903 Primary Limit Switch is a genuine OEM high-limit safety control rated at 150°F for the Amana/Goodman AMEC960403ANAB gas furnace. Mounted on the heat exchanger bulkhead, this auto-reset switch monitors supply plenum temperature and shuts off the burners if the furnace overheats — most often caused by restricted airflow from a dirty filter, blocked returns, or a failing blower. It resets automatically once temperatures return to normal.
The 150°F trip point is specific to this furnace's cabinet and heat-exchanger design. OEM ensures the exact temperature calibration and correct mounting footprint. Because the limit protects against heat-exchanger damage and unsafe operation, we recommend genuine OEM over a universal-temperature generic switch.
Intermediate (2/5). Disconnect power, remove two spade connectors, and unscrew the switch from the plenum. Always confirm and correct the airflow problem that caused the trip — persistent tripping means a restriction, not a bad switch.