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The Goodman 20162903 Primary Limit Switch is a genuine OEM safety control rated at 150°F for the AMH950704CXAB gas furnace and compatible Goodman/Amana models. Mounted on the heat exchanger, this high-limit switch continuously monitors supply-air temperature and interrupts the gas valve if the furnace overheats — most often from a dirty filter, blocked ducts, or a failing blower. Replacing a tripped or open limit switch restores safe automatic operation.
The trip point and mounting bracket on a limit switch are safety-critical. An incorrectly rated generic switch can nuisance-trip or, worse, fail to protect the heat exchanger. The genuine OEM 20162903 is calibrated to the exact 150°F factory setpoint — always choose OEM for safety controls.
Easy. With power off, disconnect the two spade terminals, remove the mounting screws, and swap in the new switch. Before replacing, rule out airflow restrictions (filter, coil, ducting) that may be causing the switch to trip.