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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue cap) is the genuine OEM secondary/rollout safety limit for the AMEC960603BNAC furnace and related Amana/Goodman models. Mounted on the burner box or blower deck, this normally-closed thermal switch opens if heat spills into an area it should not — from flame rollout, a cracked heat exchanger, or restricted airflow — instantly cutting the gas valve to prevent a hazardous condition. The color coding ensures the correct trip temperature is installed in each position.
The OEM 0130F00038 is factory color-coded (light blue) to the exact trip temperature this furnace requires. Installing a wrong-temperature generic limit in a safety position defeats the design — it may nuisance-trip or fail to protect. Always match the OEM color and part number for auxiliary and rollout limits.
Easy (1/5). Disconnect power, note the two wire positions, remove the mounting screws, and transfer wires to the new switch. Roughly 10 minutes. If it tripped, diagnose the root cause (rollout, cracked exchanger, airflow) before returning the furnace to service.