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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM thermal safety control designed for AMH80803BXBC furnaces and compatible Goodman/Amana gas furnace platforms. This normally-closed switch monitors internal cabinet temperature and opens the circuit to shut down the burner if the unit overheats — protecting the heat exchanger and blower assembly from thermal damage.
The genuine OEM 0130F00038 carries the exact factory-calibrated trip temperature keyed to the light-blue color code. Aftermarket switches often use approximate trip points that can cause nuisance shutdowns or, worse, fail to protect the heat exchanger. For a safety-critical component, OEM is strongly recommended.
Difficulty: Easy (1/5). Two-wire spade-connector swap. Disconnect power, remove the two terminals and mounting screws, install the replacement in the same orientation. Typically a 10–15 minute job for a qualified technician.
Always de-energize the furnace at the disconnect before servicing. If your furnace is short-cycling on limit, inspect airflow and the heat exchanger before replacing this switch.