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The Goodman 20162904 Primary Limit Temperature Control is the genuine OEM high-limit safety switch for the AMVC960403BNBA gas furnace. Mounted on the heat exchanger vestibule, it monitors supply-air temperature and opens the circuit to shut off the burners if the furnace overheats — protecting the heat exchanger from cracking and preventing a fire hazard. A failed primary limit is a leading cause of furnace short-cycling, no-heat calls, and repeated ignition lockouts.
The OEM Goodman limit control is set to the precise trip temperature your furnace was engineered around. Generic universal limits may be close but not exact, which can cause nuisance trips or, worse, fail to protect at the right threshold. For a life-safety component, choose OEM.
Easy to Moderate — Two mounting screws and two spade terminals. Cut power first and photograph wiring before removal. Verify correct seating against the heat exchanger.