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The Goodman 0130F00038 auxiliary limit switch is a genuine OEM overheat safety control for the AMVM970804CNAA variable-speed gas furnace. Identified by its light-blue housing, this normally-closed thermal switch opens the control circuit if the furnace exceeds a safe temperature — protecting the heat exchanger and blower compartment from heat damage caused by restricted airflow, a dirty filter, or blower failure.
The genuine OEM switch is factory-calibrated to the exact trip temperature specified for the AMVM97 cabinet. The color-coded housing guarantees you install the correct temperature rating — a critical safety concern. Generic substitutes with the wrong trip point can cause premature lockouts or, worse, fail to protect the unit.
Easy (1/5) — Kill power, remove two mounting screws, transfer the wire leads, and reinstall. A quick 10–15 minute repair with basic hand tools.