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The Goodman B1370189 Primary Limit Switch is a genuine OEM 200°F high-limit control for the Goodman/Amana ADV80905CXBB gas furnace. Mounted on the heat-exchanger/plenum, the primary limit is the furnace's main overheat safety: it opens and cuts the gas valve when supply-air temperature exceeds the safe threshold, then cycles the blower to dissipate residual heat. A tripped or open primary limit is a leading cause of intermittent no-heat and short-cycling complaints.
The OEM B1370189 is calibrated to Goodman's exact 200°F set point and probe/bracket dimensions, matching the furnace's engineered limit. Our generic-compatible equivalent offers the same trip temperature and mounting at a lower price for out-of-warranty repairs. Both deliver reliable high-limit protection.
Easy (2 of 5). Cut power and gas, remove the two mounting screws, move the spade wires over one at a time, and reseat the switch against the panel. About 15 minutes. Because the primary limit trips on overheating, verify blower operation, filter cleanliness, and duct airflow before assuming the switch is bad.