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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM thermal safety control for the AMS80804BXAD furnace. This normally-closed switch monitors temperature and opens the control circuit if it detects overheating — typically from restricted airflow, a dirty filter, or a failing blower — shutting the burners down before damage occurs.
The color-coded OEM switch guarantees the correct trip and reset temperatures for this furnace. Generic substitutes with the wrong setpoint can cause premature tripping or, worse, fail to protect the heat exchanger. For a safety device, always match OEM.
Easy. Cut power, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. About 10–15 minutes.