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The Goodman B1370155 is a genuine OEM auxiliary limit switch built for the ADS80904BNA gas furnace and compatible Goodman/Amana models. Located on the blower or cabinet, this secondary high-limit control monitors air temperature and interrupts the burner circuit if the unit overheats — protecting the heat exchanger and downstream components from heat damage.
The OEM B1370155 is calibrated to Goodman's exact 120°F trip point and bracket geometry. Generic switches often vary in calibration and terminal orientation, risking nuisance trips or poor fitment. Because this is a safety limit, genuine OEM delivers the most dependable protection.
Easy — Disconnect two wire leads, remove one or two mounting screws, and swap. Cut all power before servicing. Most replacements complete in about 15 minutes.