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The Goodman B1370187 Primary Limit Switch is a genuine OEM high-limit control for the Goodman/Amana AMS80703ANAA gas furnace. Positioned over the heat exchanger, this primary limit opens at 160°F to shut down the burners if supply-air temperature climbs too high — the furnace's main defense against a cracked or overheating heat exchanger caused by low airflow.
The OEM Goodman primary limit is factory-calibrated to the exact 160°F trip point and insertion depth for this cabinet. Because the primary limit is the furnace's core safety cutoff, we recommend genuine OEM over generic universal limits that may differ in trip temperature, probe length, or bracket fit.
Easy (1/5). Shut off power, disconnect the two terminals, remove the two mounting screws, and seat the new limit at the same depth and orientation. Roughly 15 minutes. Always diagnose the airflow restriction that caused the trip before returning the furnace to service.