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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F high-limit safety control for the GMH950704CXAC 96% AFUE gas furnace. It continuously monitors heat-exchanger temperature and shuts off the burners if the furnace overheats — a critical safety device that protects against restricted airflow, dirty filters, or blower failure.
Limit switches are life-safety components — trip temperature and mounting must match factory spec exactly. Genuine OEM switches are calibrated and rated for this furnace; generic switches with the wrong cut-out point can allow dangerous overheating or cause repeated nuisance lockouts. Always replace with the correct OEM part.
Easy–Moderate (2/5). Two mounting screws and two spade terminals; shut off power and gas first. Never bypass a limit switch. If the switch keeps tripping, diagnose the airflow root cause with a licensed technician.