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The Goodman B1370155 Auxiliary Limit Switch is a genuine OEM temperature safety control for the GDS81155CXA gas furnace and compatible Goodman and Amana models. This auxiliary limit trips at 120°F to guard secondary areas of the furnace — such as the blower compartment or a horizontal-install zone — against heat buildup caused by restricted airflow or blower failure.
Our OEM Goodman auxiliary limit is calibrated to the exact 120°F trip point and bracket profile your furnace expects. Generic replacements often differ in trip temperature or mounting, leading to nuisance lockouts or inadequate protection. For a safety component, OEM is strongly recommended.
Easy (1/5). A quick two-terminal, two-screw replacement — under 15 minutes for most DIYers. Always disconnect power before servicing the furnace.