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The Goodman 20162906 M4 Primary Limit Switch is a genuine OEM high-limit safety control for the AMVC961005CNBA modulating variable-speed furnace. Mounted on the heat-exchanger deck, this primary limit monitors supply-air temperature and de-energizes the gas valve if the furnace overheats — typically from a dirty filter, blocked ducts, or a failing blower. As an auto-reset device, it re-closes once temperatures return to normal, allowing the furnace to resume.
OEM vs. Generic: The OEM 20162906 is factory-calibrated to the trip and reset temperatures matched to this furnace's heat exchanger and bracket geometry. Generic substitutes with different set points or mounting can nuisance-trip or overheat the exchanger. For heat-related safety controls, fit OEM.
Install Difficulty: Moderate — shut off power, disconnect the spade terminals, remove the two mounting screws, and install the new switch in the same orientation on the heat-exchanger panel. Confirm the underlying airflow problem is resolved. Professional installation recommended.