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The Goodman 20162903 primary limit switch is a genuine OEM high-limit safety control for the AMH950703BXAG gas furnace. This normally-closed thermal switch monitors heat-exchanger temperature and opens the circuit at its 150°F trip point to shut off the burners if the furnace overheats — a critical protection against restricted airflow, dirty filters, or blower failure.
Limit switches are calibrated to a precise trip temperature and mounting footprint. Our OEM Goodman switch guarantees the correct 150°F setpoint and factory bracket fit. Generic switches with a different temperature rating can nuisance-trip or, worse, fail to protect the heat exchanger — for a safety control, always use the exact OEM replacement.
Easy–Moderate (2/5). Disconnect power, remove the two mounting screws, transfer the spade wire connectors, and mount the new switch. A multimeter to confirm continuity is helpful. If the switch keeps tripping after replacement, diagnose the underlying airflow restriction rather than bypassing the control.
Never jumper or defeat a limit switch — it is a life-safety device.