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The Goodman B1370195 Primary Limit Switch is a genuine OEM high-limit safety control for the ADS80703AXA furnace and other compatible Goodman and Amana gas furnaces. Mounted on the heat exchanger or supply plenum, this 300°F normally-closed switch opens to shut off the burners if the furnace overheats — typically from restricted airflow, a dirty filter, or blower failure — protecting the heat exchanger from cracking.
The OEM Goodman limit is factory-set to the precise 300°F trip point and mounting flange your furnace uses, ensuring proper overheat protection. A generic equivalent is offered at a lower price for budget-minded repairs, though trip accuracy and bracket fit are best guaranteed with the genuine part on a primary safety device.
Difficulty: Easy (2/5). Cut power, remove the two mounting screws, transfer the wiring, and reinstall in the same orientation. Most replacements take 10–15 minutes. Run a full heat cycle afterward to confirm the limit holds and resets correctly.