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The Goodman B1370155 Auxiliary Limit Switch is a genuine OEM 120°F high-temperature safety control for the Goodman ADS80453ANA furnace and compatible Goodman/Amana gas furnaces. Typically mounted on the blower deck or near the cabinet, this auxiliary limit opens the control circuit if temperatures in its zone exceed the 120°F setpoint — guarding against overheating from restricted airflow, a failed blower, or a dirty filter.
When this switch trips repeatedly or fails open, the furnace will short-cycle or refuse to run. The correct OEM auxiliary limit restores reliable thermal protection at the proper setpoint.
OEM vs. Generic: The genuine Goodman switch is matched to the exact 120°F trip point, reset behavior, and mounting footprint the furnace requires. Generic substitutes with different ratings can cause nuisance lockouts or fail to provide the intended overheat protection.
Install Difficulty: Easy. With power off, remove the two spade connectors, unscrew the switch from its bracket, install the replacement, and reconnect the wiring. A quick 5–10 minute swap; confirm the root cause of any trip with a qualified technician.