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The 10123529 is a genuine OEM manual-reset high-limit safety switch for Goodman and Amana ADSS800403AXAB gas furnaces. This thermally activated switch protects the furnace from overheating and flame rollout: if temperatures at its mounting location exceed the trip point, the switch opens the control circuit and shuts down the furnace, requiring a manual reset button press before it will restart. A tripped or failed limit switch is a common cause of a furnace that won't fire or that locks out on a safety fault.
The genuine OEM switch is calibrated to the precise trip temperature specified for the ADSS800403AXAB. Because this is a safety component, an incorrectly rated generic switch can trip too early — or fail to trip when it should. Always use the OEM part for correct, safe protection.
Easy to Moderate (2/5). De-energize the furnace, disconnect the two leads, unscrew the switch, and install the replacement. Repeated tripping indicates an underlying airflow or combustion problem that should be diagnosed by a technician.
Compatible model: ADSS800403AXAB. Confirm fit at info@nationalhvacparts.com.