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The Goodman B1370155 Auxiliary Limit Switch is a genuine OEM overheat-protection component engineered for the ADV81155CXA gas furnace and compatible Goodman/Amana models. Rated to open at 120°F, this auxiliary limit monitors secondary airflow and enclosure temperature, shutting down the burners before heat can build to unsafe levels. It is a factory-calibrated safety device — matching the exact trip point is critical, so an OEM replacement is strongly recommended over generic guesses.
This is the genuine Goodman part with the precise 120°F calibration and mounting footprint the furnace was designed around. Generic universal limits often carry loose temperature tolerances that can cause nuisance lockouts or, worse, fail to trip on time. For a safety control, OEM accuracy is worth it.
Easy (1/5). Two-screw mount with quick-connect terminals; typically a 10-minute swap. Always shut off power and gas before servicing. If you are unsure about limit-circuit wiring, consult a licensed HVAC technician.