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The Goodman 0130F00038 Auxiliary Limit Switch is a genuine OEM overheat safety control (identified by its light-blue housing) for the AMVC800604BNAA gas furnace and compatible Goodman and Amana models. The auxiliary limit monitors temperature at the blower or secondary heat-exchanger area and opens the circuit if the furnace exceeds its safe operating temperature, protecting the equipment and home from overheating.
Goodman color-codes limit switches to a specific trip temperature, so the OEM 0130F00038 guarantees the correct set point and bracket geometry. Installing a wrong-color or generic switch can either nuisance-trip the furnace or, worse, fail to open at the intended temperature — a genuine safety risk. Always match the exact OEM part for limit controls.
Difficulty: Easy–Moderate. Shut off gas and power, note wire positions, unscrew the mounting bracket, transfer the spade connectors, and reinstall. Confirm the switch seats flat against its mounting surface. After installation, run a full heat cycle and verify the furnace reaches steady state without tripping. Have a technician diagnose the root cause if the original switch was tripping repeatedly.